Why is my young female dog suddenly attacking my older, fearful dog?

Ruby is probably trying to become top dog as she senses that Annabelle is getting older. I would separate them to eat, and monitor them more in the yard. This can be an isolated incident or it may become serious. I reprimand Ruby if she is acting aggressive, hopefully when she is just starting. I find competing for toys and food makes this behavior worse so eliminating those things to fight about should help. Also make sure you pay attention to both. If Ruby seems aggressive I separate them and put Ruby in a crate until she calms down. While this is natural behavior it can be bad so please protect Annabelle. Thanks for using Petco Pet Education Center, formerly Petcoach to help you care for Annabelle and Ruby.

Aggression issues within the household can be scary and dangerous, particularly in situations like this where one dog is much older and younger than the other. I would approach this situation with a lot of care and patience. As you have asserted already, it would appear that the Springer seems to be guarding or possessing the house. In order to truly dissect this situation, I would need you to really think about where these incidents have been occurring within the house and how they might be preceded. Think about if they tend to occur in one area more than another, if they are only occurring when other people are around, if they are only occurring before or after some sort of event or instance, etc etc. If you can't identify any patterns, you either have to keep the Springer on leash inside the house until she can be retrained or keep the two dogs completely separate. This would be the only two options to keep the 10 year old safe and sound. I would be happy to speak with you in some more detail regarding the behavior issues in a consultation. These tend to be quite complicated and will require more time and details than I am able to write in this small area. Good luck to you either way.

When you have two bitches together, they will show aggression to compete for territory and intact males especially if they are in heat. The best thing to do is to have both of them spayed. This will reduce the aggression between them as it is most likely hormonally related. It will also eliminate the risk of a pyometra, which is a life threatening infection of the uterus. Without spaying them, you will have a very hard time reducing the aggression because it's hormonally related. Removing the source of the hormones is the best way to stop the aggression.

I would make sure the dog that has become aggressive isn't having any other issues like pain or discomfort. Also, has anything change in your schedule or house that could have made her feel more insecure or anxious? You could talk to your vet about starting her on an anti-anxiety medicine like fluoxetine as this may help. I would also make sure they aren't becoming aggressive over any treats, bones, toys, etc. I hope this helps and she starts to act like herself soon.

Thanks for using Petco Pet Education Center, formerly Petcoach. This sounds like it could be anxiety related, probably due to (or worsened by) the recent trip. Try separating them for a day or so, then taking them for a walk together. If it continues for more than a day or so, talk with your vet about anti-anxiety medications which can help tremendously with this sort of thing. Best wishes to you, Charlie, and Grey!

If this is real aggression, you may need to separate them until after the heat cycle and hope for the best. Sometimes problems can persist beyond that. Typically, households with altered dogs will have a lot less conflict than households with intact dogs. There are many benefits to spaying and neutering and I recommend to discuss this with your veterinarian: https://www.petcoach.co/article/spaying-ovariohysterectomy-the-benefits-in-dogs/ Canine aggression is a complex behavior as it can stem from dominance, possessiveness, fear, anxiety, resource guarding or a combination. Most people are not familiar with reading canine body language and training. Because of this, I recommend to work with a professional trainer. Researching on your own will also be helpful. Familiarizing yourself with canine body language and dog training can help you to recognize what your pet is trying to say. You can find many books written on the topic and there is a trainer named Victoria Stilwell who I think is particularly helpful. Best of luck.

Female to female aggression is very hard to manage. Are all your pets spayed and neutered? This is the first thing I would do if not. Some of the worst injuries I have seen are between two females in the same household. They are likely establishing dominance and there are things you can do to reinforce the “leader” by feeding them first (or feed them all separately), letting the alpha dog walk in front when taking walks. I strongly suggest you work with a behaviorist and take aggression seriously bc I have seen it escalate quickly. Hope that helps.