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Aggression in Border Collies

Aggression in Border Collies

Aggression is not a common trait in Border Collies in general, but it can happen. The causes and reasons behind the dog growling, barking or even biting can vary depending on the situation.

When dealing with an aggressive Border Collie remember that unlike other behavior problems this one can have serious consequences. If you suspect that your Collie might be showing early aggressions signs, act immediately. Don’t let the behavior go unchecked because it will only get worse unless you do something about it.

It’s very rare for these dogs to get aggressive without showing early warning signs beforehand. Unless the dog is in physical pain or feels threatens, it will show signs of aggression before doing anything drastic (like attacking you or biting you).

Look for these signs to warn you before your dog becomes aggressive:

  • Disobedience of known commands
  • Growling or showing of teeth when you push them off furniture
  • Dominance issues
  • Barking at you or others

To learn how to deal with a dominant or disobedient Border Collie, I highly suggest you check out the Border Collie Owners Guide. It’s a complete guide that covers step by step on how to deal with each behavior issue.

To learn more click here…

Most Common Cause of Aggression

There are several causes for aggressive behavior. Some are a lot easier to spot and cure, while others will take time and will only be cured with consistent behavior training.

  • Dominant Aggression- If your collie has developed dominant behavior, then she might feel like she needs to use aggression to keep her dominance over you. A Border Collie that feels like she is above you in the social dog hierarchy will not hesitate to growl at you or even bite you. So be very cautious when dealing with a dominant Border Collie.
  • Border Collie feels under threat – This type of aggression is most common towards strangers or people the dog doesn’t already know. If your collie feels threatened or doesn’t trust a stranger then she most likely will let them know to stay away by growling or barking at them. This type of aggression is also very common amongst dogs that bark at the mailman, strangers on the street or your neighbors.
  • Physical Pain – When a dog is in pain, it’s under a lot of stress. As much as your Collie might love you and trust you, you should be very careful when inspecting her wounds. If she feels pain, she just might snap at you to let you know what she doesn’t want to be touched.
  • Food Aggression- Just like any other dog, your Collie is never sure if the food you give her now will be there five minutes later. To them, it seems like they better eat it now before someone else takes it away. So when you try to reach in to take your Collies bone, or adjust the food bowl, you’ll hear a distrustful growl. Of course not all dogs behave this way, but it’s in their instinct to be defensive of their food from others.Never stick your hand into your dog’s food bowl if you suspect he or she won’t like it. Same goes for messing with your Collie when she is too busy with a bone. What you can try though is call your dog over and give her another treat when she is busy eating or chewing her bones. This will help get her attention off the food and will show her that if she leaves her food for a little, you won’t steal it for yourself.

How to Deal with an Aggressive Border Collie

The way you approach the situation greatly depends on the original cause. So the first thing you must do is figure out what is the real cause for aggressive behavior. When does your Collie act aggressive? Who is the aggression targeting? How long has this been going on? When you answer those questions, you will have a better understanding of why your dog or puppy is acting aggressive.

Whenever you feel things are getting out of hand, stop what you’re doing and leave the room. You don’t want to escalate things if you don’t have to. You won’t solve your dog’s aggression by making your dog angrier.

If your dog has developed dominance issues, then you will have to regain the “alpha dog” title. The most effective way to do it is by starting obedience training, because that’s exactly what the alpha dog role is for. Once you start training, teaching and leading your Collie, it will start viewing you as the pack leader. To learn more read this article here.

What NOT to do with an aggressive Border Collie

Before you do anything, there are a couple of things which you should NEVER do to an aggressive dog. This won’t help solve aggression and in many instances, it will anger your dog even more.

  • Do NOT… pressure your dog when it’s in a stressed state. If your dog is growling at you when you approach it, don’t think it’s a good idea to get closer. When the dog is growling, it is warning you not to come closer or to stop what you’re doing. So respect your dog’s wishes.
  • Do NOT… shout, yell or hit your Collie. Your goal is to diffuse the situation, not to make things worse. Those should be your last options and should only be used if you’re under attack. If you feel in danger, try to remove yourself from the situation as soon you can.
  • Do NOT… play aggressive dominance based games with your Collie if it already is showing signs of aggression. This means no tug of war, keep away or chasing games of any kind. Instead focus on other games like fetch.

When to Seek Professional Help

Aggression is not a joking matter, especially with the larger dog breeds. If you don’t feel confident enough to tackle the problem on your own or feel fearful of your dog, it is better that you seek help from a professional dog trainer. Your dog can sense when a person is unsure and nervous and will be less likely to listen to you if you show those emotions.

If you feel in danger or are fearful that your dog might bite someone, please don’t hesitate to call your local dog trainer. Give them all the necessary details and they will know exactly how to handle the situation. Don’t wait until your dog bites someone before you do anything.


If you want to learn how to cure even some of the worst Border Collie behavior problems and the exact things you need for a happy, healthy and obedient dog, check out the Border Collie Owners Guide.

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32 Responses to “Aggression in Border Collies”

  1. Steve says:

    I have two ‘Rescue’ Border Collies – one 10 year old and one two year old. I’ve had the eldest for almost 4 years and the youngest for 4 months.

    For the first 3 months or so, the youngest was so friendly to anyone taht he came in to contact with, brushing up against them, just allowing themself to be stroked.

    In the last month though, he has become quite aggressive towards people that he has known since I got him.

    If somebody is stroking him, he will (quite regularly now) bare his teeth and tonight actually bit a young boy that was stroking him.

    Fortunately, his Dad knows that I am trying to deal with the problem and is letting it go.

    This first became apparent after we had been running so I put it down to him being ‘hot and bothered’ but the following week he bared his teeth at my nephew, who was just sat on a seat several feet away from us.

    Initially, I think that I should muzzle him (as much as it would pain me) while we are out, as he has shown no signs of aggression to me or my girlfriend as yet.

    He lives with the elder dog and I, but nobody else, so I’m unsure whether he has started to become protective over me recently, but I don’t understand why.

    He is deaf but I don’t believe that this is connected to his behaviour in any way.

    If anyone can offer advice, then it would be greatly appreciated.



    • willimaz says:

      I have a 9 month old border who is deaf in one ear and she just started snapping at strangers. Today she snapped at my 23year old nephew. She charges at people who come to close to our house. She’s extremely submissive so I take her out everyday to try to socialize her with strangers. My vet and I talked about medicating her for her anxiety but I’m not really sure what to do for her.

  2. Courtney emmett says:

    I had to put my 8 year old borer collie down last week, because of dominance biting. Over the last 8 years she had seriously bitten my son twice, requiring an emergency room visit with stitches. But he was younger and I had hoped puberty would make her less aggressive towards him. She bit my daughter three times but not seriously, just scraping the skin. She got my husband twice when she was just a puppy, punctures but no ER visit needed. And the last bite was to my husband and it was very serious. She almost took out his eye and she took the tip of his nose off. That bite was unprovoked and unsuspected. She was a very lovable and affectionate dog and we all adored her. She had never bitten me, but I did notice that she was no longer listening to my commands and I would have to go get her and make her obey me.
    I did a lot of training with her when she was young. We did obedience and sheep herding. I studied dog behavior and watched documentaries on wolves, so I was not ignorant and I understood that she was a dog and that I needed to treat her like a dog. But I still wonder if I could have done something wrong, and what it was.
    I was the one who had to take her to the vet to have her euthanized and I am still sick to my stomach over it, but I would not give her to another person and put them at risk and I don’t think it is humane to keep a dog isolated. They are pack animals and should not be away from the family or other animals.
    I am not sure what I could have done differently and every day I wish she were still with us, but I could not risk another attack like that. And I cannot understand what behavior he did that she was correcting, since he was laying on the floor petting her and she was completely affectionate and and content…laying on her side and wagging her tail…and then just whirling around and biting him. My vet had told me that they know within millimeters of where they are biting. Since every bite was to the face, but really to the mouth and nose area, I know they were corrective/dominance bites. I just don’t understand what my husband did that she considered to be an unacceptable behavior.
    Anyway, good luck….you really might consider getting an expert on dog behavior. I hope this helps.

    And BTW: anyone who wants to beat me up for putting her to sleep….don’t bother, I hurt so much that your words cannot make me feel any worse than I do.

    • Claire says:

      I don’t think anyone can beat you up. The truth is that once a dog bites someone seriously there are very few courses of action you can take. Many rescues won’t take on a dog that bits, and when they do it’s usually to assess them and then often to put them to sleep.

      I myself rescue ‘unruley’ Collies as I am a bit crackers. There is always that fear in the first few weeks that they will have be put down. Luckily to this day 12 dogs have come through my doors, and all have gone on to homes. My latest boy is unfortunately so fear-aggressive that he won’t be rehomable – so I have decided to keep him. After 4 months work I am seeing improvement, but it may be another year before he is ready to be around the general public. And then I’ll start rescuing again! ;)

      I feel so sorry for you and your family, you obviously loved her deeply to have tried for this long. My thoughts are with you. X

      • Bree says:

        Claire could you please offer a little more insight about what techniques you use to socialize and rehabilitate your rescues? you seem to be the only one in this thread who’s had any success…

        my parents have a 5-year-old BC who’s extremely loving to members of our family. however she hates outsiders. she doesn’t allow anyone into the house including my brother’s friends who have been around since she was a puppy and spend more time at the house than me. she hides out behind the couch and will race out to try biting the back of their legs.

        she was extremely difficult to socialize as a puppy. affectionate, hated bein held and very fearful towards new people.

        on walks she lunges at cars, birds, low flying airplanes. she spends so much of the time being anxious that she doesn’t seem to enjoy it, we certainly don’t. she does seem to calm down and focus if she’s off leash in the yard playing fetch as long as she’s the only dog(my dog visits often and she’s learned to keep her distance because the BC is very unpredictable with her, sometimes she’ll play but then something will trigger her and she needs to “correct” my Boxer who’s good about just walking away. the BC gets upset afterwards and trembles.)

        she spends a lot of her time to herself behind the couch, i think they should block off access so she’s forced to be out and social but my parents are at odds about takin away her safe place.

        has anyone else had luck? do anti-anxiety meds help!?

        • Amy says:

          I have a BC who is just over 3 years old. I brought her home at about 6 months old (her first family did not have her trained except to come when called) I love her dearly but fear it may come down to finding her a new home. We have a second dog that is just over a year old. He came to us at 8 weeks so my BC has known him and been around him all this time. She is getting more aggressive in the last few months and today I had a heck of a time pulling her off of the younger dog. She actually drew blood. I know there is a food aggressiveness that has been developing between them lately and I am not sure what has made this happen… Anyway – my BC is currently on doggie Prozac as well as melatonin. She has been on them for about 6 months or a bit longer and they do not really seem to do much of anything. I have tried other meds and nothing is working. I am wondering if I need to find a rescue for her. Maybe she would be happier in a different home setting. I have never let one of my pets go and am not sure what to do for her. She is nervous around heavy car/truck noises. She barks at everyone who comes in and hides from people she doesn’t know. I could use some tips if any of you have any. Good luck trying the meds – they really don’t seem to be making a difference for us.

          • Cheri says:

            I am fostering a rescue whom i was told originally she was a Golden Retreiver. But after I got her( I had only seen photo) I determined she did not have Golden Retriever personality. I thknk she is a Border..he herds, is as sweet as can be and loves everyone until they come into my house. Then she goes nuts. My oldest son has been staying with us and he has been around dogs all his life..the dog walked p and sniffed him..then immediately started to bite him. Now we have to crate the dog when my son comes upstairs. This dog was picked up by animal control so we do not know his history. My son says the dog is docile when I am not in the house..but he is still crated while I am gone.
            Last night my teenager jumped up off the sofa and the dog gt excited and jumped up and nipped him on the ankle. My son turned around and grabbed the dog (told him NOT to do that) but then it turned into an all out struggle. Now my family wants to get him out of the house..but he is really really sweet and dumping him will not make the problem go away. HELP!

    • Laurel says:

      I am so sorry you had to put your dog down, it’s a tragedy. But I feel you had no choice. What a heartbreaking thing. However, the next time your dog might have very well blinded someone. A face bite is VERY serious, much more so than nipping an ankle.

      I’ve had trouble with biting issues with past dogs, and currently have an issue with a new (adopted) 5 year old BC, who nips ankles and feet. I shudder at the thought of having to be in your situation, but please know I do not blame you.

      What is especially agonizing is that such dogs are often deeply affectionate to owners, and the biting seems to come out of NOWHERE. From my reading, this is an issue with some border collies and aussies — something about their breed, the instinct to bite and nip the sheep or goats they herd.

      In your case, it went clear over the top though. I am so sorry for your loss. And Claire is correct; you cannot rehome a biting dog and no shelter will take them on, not after a bite of that serious a nature. What you did, to take her in to be put down yourself, in a humane manner, is the only decent thing you could have done in this situation.

    • ber says:

      Thats a very sad story, I feel very sorry for you and her, I know it must have been a very hard decision to make, try not to beat yourself up about it!! i’m sure you gave her the best life you could when many people would have given up on her!!

    • Derrick says:

      Thanks very much for posting your story. We tried a 2 month old female border collie this Christmas for our 6 and 8 yr old daughters. We had nipping incidents on day two, our 6 yr old with a bite mark on her nose (just missed breaking the skin) and scrape beside the eye, completely unprovoked. Shortly after that one, my 8 yr old was sitting across from the pup and she lunged at her nose. She was wearing the small nose breathing ‘bandaid’ across her nose, which I think saved a serious bite. Earlier in the day, she nipped at my 21 yr old daughter’s nose, but no bite mark. Over the next couple of days, we kept her on a leash at all times. Taking her outside, she started getting more aggressive, and bit our 6 yr old on the arm, putting two holes in the jacket, but not harming our daughter physically. I started researching border collies and aggression, and read several websites, with your posting hitting home. We went so far as to call a dog behaviourist, and long story short, she said this was not natural, and take the dog back. My wife was heartbroken as she really was a cute loveable dog, but did not like kids. Outside , she was aggressive towards other kids, and other people approaching, a group of teens tobogganing nearby, loud barking and aggression. We brought the behaviourist to our home for an hour visit, basically for reinforcement. With the Christmas frenzy, did we give her the right chance and opportunity to blend in? She was marvellous and it helped to confirm to my wife that we had to take her back. It was not natural behaviour, she did not see it as something she could correct, and as she said there are many pups out there who want to roll and play around with young kids without the fear of biting. She is apparently one of only seven such behaviourists in Canada, and we appreciated her honesty, as we could have ended up paying a lot of money trying to correct this with her. The people we got her from had many other groups interested, and were going to send her to a farm that specifically wanted her for herding. We stressed she could not be around kids. Even bringing her back to the house from a walk, she would start nipping at my hand, which was scaring me. We didn’t get the pick of the litter we were hoping for, but will try for next time. Once again, thank you very much for helping us with your experience!! I know it helped to save us from an emergency room and plastic surgeon, Absolutely!! I hope your Husband is healing well, and things are much better for you!

      • jane lewis says:

        border collies do not generaly make good family pets, they need to work and have things to do, they get bored very easy. its not there fault they lash out

    • Lynne says:

      I am so sorry about having to put your BC down. We are praying we don’t have to do the same. Our pup is young and very afraid and shows his fear with aggression. He is never aggressive towards our family but with strangers and dogs. We are dedicated to try everything to fix him before having to put him down so we just sent him off to board and train for a week where they will work on his anxiety. We will probably do prozac also. It is so sad that these dogs have to deal with these demons! I am praying my little guy can learn to trust everyone like he does our family.

  3. Kaylynne says:

    My border collie is 5 years old or so, and we just got her from a relative of mine because he didn’t want her anymore. I do know that she was locked up most of the time, but since we’ve had her here, she’s had almost complete freedom and plays a little rough with my other dog. She’s really defensive and temperamental. She growls a lot. She hates being touched when woken up, but she’s fine you just say her name. She hates being brushed, doesn’t necessarily listen well unless you’re stern with her, and if you’re unfamiliar to her, she will bite you if you put things by her face. Tonight she bit me while i was going to cut off some matted hair, and she broke skin for the first time. She’s not usually as aggressive with me seeing as I spend a lot of time with her excercising, but this was really rough. My parents are saying they’re going to get rid of her if I can’t get her to stop being so aggressive, but I’m not entirely sure what to do anymore. I cant call a local dog trainer because I’m absolutely broke. Does anyone know what to do?

    • Jay says:

      Hi Kaylynne,
      I have a border collie also.
      Although I have been brushing my collie daily since a pup she has decided its not as good as it used to be and now shows her displeasure. I can also tell you most dogs do not like having matted fur or whatever else cut off from them and will let you know in no uncertain way as does my dog.. I envy those who are able to do this with no problem. . Also when dogs first awake, like children, they need to take time to “come around” first . My dog wakes sometimes as if he was in a deep sleep and looks up as if to say where am I. It,s so funny. Your collie is also finding her place in the “new pack” . Best of luck and with time and patience I hope all works out for you

  4. Jay says:

    Dear Claire,
    I have had two rough haired collies and my last dog was a border collie and my dog now is a border collie who is 3. I find my dog Harry shows a lot of signs of I know what you want but I will do it when I want and anything else I will show my teeth so I get my own way. When we have visitors Harry doesn’t.t know I have to put him in another room as he wd growl and bite if he fancies to. He is otherwise very cuddly and loves my massages he gets given by me, with all your knowledge of various dogs are you able to offer any help on my situation. I wd be very grateful for any advice.

  5. Rae says:

    I have a border collie blue merle,beautiful looking male but temperment not so good.I wish I could rehome him.he jugs 13yrs old.he really won’t left anyone go near him to brush him he shows this teeth and barks aggressively.what do I do.anyone have any advice.PLEASE

    • Laurel says:

      I know this is tough, but he is 13 — that’s like 90 in human years. Nobody will adopt an elderly dog, and worse, he has behavior issues.

      As I stated above, try getting a MUZZLE and a CRATE. At 13, he does not have that much longer. You can keep him safe from harm and yourself safe from his biting or nipping, by controlling him.

      A prong collar, PLUS a backup collar, is a good idea. This is not costly. Don’t use just the prong collar, they can fall apart at unpredictable times. Always have a regular collar, or ordinary choke chain as well (or the Martingale type).

      I wish you good luck. Please try to keep this old fellow around; he would suffer terribly in a shelter and probably end up being put down.

      If nothing else, and you must put him down, go to the vet and ask for help in doing this in kindly and humane manner.

    • jane lewis says:

      should’nt have a dog cause he looks pretty

  6. mrs champion says:

    hi i have a border collie and he has always niped but never me or my husband the only one is my 4 year old but not enogh to leave any marks he is very well behaved the only things is cars bikes or and thing with wheels or strangers he will nip or lung at them i dont really know wat to do but i want to get it sorted befor he gets older if and one can help ???

  7. Dawn evans says:

    I have a 3 year old boy border collie and was lovely but in the last year and half he has become very agresive not to me well he snarls at me every now and then but one min he is fine next he gos for my 10 year old daughter and my 8 year old has not broken the skin yet but I don’t want to leave it till that happens we all love him but I love my children more I think I’m going to phone the vets not that I want to but don’t think I have any choice any more does this make me a bad person please help dawn

    • avril says:

      I have just come back from taking my 27yr old stepson to the hospital, as our 3yr old border collie just took a chunk out of his cheek and jaw! He has always been best of friends with my stepson and this was totally unprovoked. We have had a couple of episodes of him biting but not breaking skin and to have this happen has made us realise that this is one attack we can’t ignore. So for the safety of my younger children i feel we have no choice but to have him put to sleep even though it will break our hearts. My stepson has to have facial surgery, but is still more upset for the dog than himself. So if you have to put your familys safety before your dog, than thats a choice you simply have to make. Good luck.

  8. Janie says:

    I have a 3 year old Border Collie, and she is my first BC. I adopted her in 2010 from the SPCA. Tootsie chose us, I was actually looking for another Black Lab as I had to put my baby down when she was 17!

    Tootsie is pure love. She is 40 lbs of joy! She hates water and being brushed. Thankfully, she is very non-aggressive! She just gently moves away or suffers my attentions lovingly!

    Tootsie is a dog. I treat her her as such. She is mainly an outside dog but I bring her inside when the temps hit below 38. But she is my fur baby too. She loves rides in the car. Occasionally a treat from my plate. Playing kill the tennis ball as we are still working on bringing it back to me!

    I’ve had to put down animals down, cats and dogs. It is so damn hard. I feel for every one faced with this.

    You are all, two legs or four, in my heart, thoughts, and prayers. God bless!

    “A dog is the only creature capable of loving you more than itself!”

  9. Cristina says:

    Hi! I have a 6 year old Border Collie. Recently she has started nipping people. She has not done this before, but for the last two months she has. Luckily she does not touch anybody’s skin. When she nips I grab her nose and say no. How do I stop my dog from nipping?

    • Eliza says:

      By grabbing her nose you might end up with a bit as well. Keep her on a lead when people cone over if she goes to bite lead her away and lock her in the bathroom or another room away from you. After several minutes try again.

  10. Tabitha says:

    Our border collie is 8 years old, and is a very well behaved dog almost all of the time. He is great on and off the lead, although this did take us a lot of training with a military dog instructor. The only bad things we can say about him is he not good around kids (we did not know any children when he was a puppy to socialise him with) and did nip at my niece once when she was patting him even though just a few minutes earlier he was loving being patted. We do not leave him alone with my nieces at all, as he had an earlier tendency to “round them up” like sheep. He has not done this for some time though, but we still do not allow them to get close to him or take his ball as he can be so unpredictable, which can be hard as they love playing ball with him. He also absolutely hates the vet and we have to muzzle him for any visits. Last visit, he soiled and wet himself when the vet took him away from me to just cut his nails and recommended we have him put under anaesthetic next time it needed to be done. (to be fair to our dog, the vet did cut too far and hurt him, caused him to bleed which really annoyed me) Any ideas on how to correct this behaviour as we really don’t like to leave him out when family is over (he whines at the door like he is excited) and as for the vet, well no one likes to see their dog that frightened. Thank you!

  11. Sarah says:

    Help!! My 7 and a half year old Border Collie has always been quite nervous from around 12 months old. We’ve had her since a pup and shes never been mistreated. She always growls at strangers and it takes her a whole before feeling comfortable with someone. We have our own routine when introducing her to someone new in our house. Chrismas day our house was manic, and she tried to bite someone she’d never met(we ha explained to the person what shes like and that she needs introducing properly, he thought he’d be the exception). Anyway, he was quick and was unharmed. Today my mother in law dropped my 2 year old home, and she went for my mother in law. My dog has know her all her life, and has stayed with her on numours occassions. I am quite confident she wouldnt hurt my daughter, theyre best mates. I just dont know what to do. :(

    • Lynne says:

      I would love to chat with someone going through the same thing as us. We just sent our BC off to boot camp and hope they can “fix” him. Let me know if you want to talk privately.

  12. Ro says:

    I have a 13 month old BC since she was 8 weeks old. She was born from dogs working cattle so she is no show dog but exceptionally muscular naturally and has more energy than most BC. Yes, more. I brought her to my olive grove where she runs free and I run her on the beach as often as I can.

    I have come to the city for 8 weeks where she has a decent backyard, for a city block, and I have started walking her twice a day. She is showing super amounts of agression to other dogs when we walk but no problems with the Staffy we are staying with, nor any other dog she has ever spent time with.

    She has always been excited to see other people, doesnt jump, but because they aren’t stopping to say hello to her she is now barking and pulling on the lead in an agressive manner more than excitement. I never have these issues when she is off the lead, but you cant have dogs off the lead when walking them.

    I want to take her to a dog park where it is legal to run free and socialise, but am obviously worried. Should I take her back home to the olive grove?

    Advice please… :0(

    • Amber says:

      They mostly want to run free from what I’ve noticed from our BC. Our BC is happiest when she can play in the yard and do as she wants. I don’t know if the city life is best for them.

  13. Amber says:

    I have a year and a half female border collie. We love her dearly but she doesn’t mind very well. Can anyone tell me at what age they calm down? Our BC is extremely hyper and is always getting into trouble.

  14. Jamie says:

    I have a 2 &1/2 year old border collie. She is very loving, but extremely energetic. We also have 3 other dogs all older. We got our border collie from a friends who could not keep her. She was not trained in anyway. When we first got her our 8 year old lab and her got into a couple fights but then it stopped. Now we’ve had the BC for 2 years and recently the last 2 months the lab and BC have been fighting a couple times a day. It has gotten so bad we’ve been to the vet a couple times due to bites so bad they’ve gotten infected. It seems the BC gets the worst of it but she had gotten the lab good a couple times. We don’t understand why this is happening and not sure how to fix it. We do not want to give her up, we love her dearly. She is part of our family. At first we thought it was the hear being summer and all, but now were not sure. We see her herding traits come out before it happens. She seems to be stalking the lab everyone she moves. Please if anyone has suggestions on how to deal with this.

  15. Kim says:

    I have a eight year old boarder Collie that is a big sook. (Most of the time) He has been accessed to having territoral aggression which we have learned to live around but lately he he very agressive with us when we go to leave the house. He freaks. His whole face changes, he barks and comes at us, as if to bite us.I am even scared. It is worse now because I just had my second child and I am home more with him. He has bit a girl, a long time ago on her anckle when she went to leave. He broke her skin and it did get infected. I am scared with two young kids about this getting worse and worse. I don’t know what to do. He is a good dog to the family other than that and a sook. Anyone???

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