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My dog suddenly attacks other dogs. How can I stop this behavior?

Updated On September 23rd, 2025

Pet's info: Dog | Boxer | Male | unneutered | 3 years old | 65 lbs

My 3 year old boy loves people so much and up until about a year ago he loved other dogs, but has started to become unpredictable with other dogs. Fine one moment then aggressive the next. Recently I had him for a walk with a friend and her dog, and they were fine walking together for about an hour and then all of a sudden bandit just attacked the other dog. He’s known this dog since he was little, the other dog Wasn’t even paying attention to him. This has happened several times now. Help!

1 Answer

Most Helpful Answer

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Answered By Jessica Keay, DVM

Veterinarian

Published on August 23rd, 2017

I am very sorry to hear about Bandit. This is a scary situation if Bandit is truly giving no warning prior to his aggressive outbursts. There may be subtle changes in his behavior that are difficult to pick up on without having observed aggressive dogs in the past. Neutering may help decrease his aggression toward other dogs but truly with unpredictable aggression like this a consultation with a veterinary behaviorist is recommended. They can discuss Bandit with you in depth, examine him and observe him in different situations and come up with a training plan to help you manage him (or they may advise he not be around other dogs if they feel his behavior is too unpredictable). I would talk to Bandit's veterinarian to find out about veterinary behaviorists in your area.

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