My dogs suddenly started fighting. What causes this aggression?

Question

My 3 dogs are always together and just a few days my one dog started attacking the other. And now I have to keep them apart because of it. Would there be any reason why this happened? This has never happened before. Pet's info: Dog | Mixed Breed | Male | unneutered | 9 years and 7 months old | 26 lbs

Jennifer Summerfield, DVM CPDT-KA · Accepted Answer

Hi there! Aggression between dogs in the same household is a complex behavioral issue that's difficult to address properly in an online forum. In general, I can tell you that common triggers for aggression between housemate dogs include resource guarding over food or toys, redirected aggression due to barking at something exciting outside, or over-arousal during play. If the problem is severe enough that the dogs can no longer be together at all, then I would strongly recommend making an appointment with a veterinary behaviorist. He/she can evaluate the dogs in person to help determine what is causing the aggressive behavior, and will help you put together a detailed training plan to work on the problem so that hopefully they can get back living together peacefully. You can search for a board-certified veterinary behaviorist in your area here: www.dacvb.org

My dogs suddenly started fighting. What causes this aggression?

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