My normally sweet dog is suddenly aggressive with our other dog. Why?

Question

Gracie has become suddenly very aggressive with our male lab. She is 19 lbs and petite, he is 75 lbs and a big boy. He is submissive for the most part, but will fight back if need be. For example, he was laying on the bed and she walked over to him, growled and started attacking. She normally is very sweet and docile, so this behavior is new and not normal. Thoughts on what to do? Pet's info: Dog | French Bulldog | Female | spayed | 1 year and 2 months old | 18 lbs

Jessica Desrosiers · Accepted Answer

With any sudden new behavior such as aggression in normally well behaved pets, it is best to schedule a vet visit. Pain and underlying illness can sometimes lead to sudden aggression or other behavioral changes which can lead to one dog attacking another, or the dog in pain becoming overly defensive and causing fights as a way of protecting itself against the perceived pain. Having both pets checked out for any issues is a good idea. If they both check out healthy, speaking with a trainer that can observe the behavior in person (and/or taking video to show a trainer) may help figure out if there is a cause to the sudden change and what can be done to help.

My normally sweet dog is suddenly aggressive with our other dog. Why?

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