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My dog used to be calm, now aggressive with other dogs. What to do?

Updated On September 23rd, 2025

Pet's info: Dog | Tibetan Spaniel | Female | spayed | 2 years and 10 months old

Hi. I have a little dog and she used to interact with dogs and be calm and playful. But now this year when she sees a dog she wants to fight and I feel that it is getting out of hand because she also barks when she sees dogs. Any suggestions for what I can do to stop this??

1 Answer

Most Helpful Answer

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Answered By C. Rathjens, DVM

Veterinarian

Published on April 26th, 2017

Unfortunately, this is a really common change in 2 year old dogs. Molly is reaching social maturity and things that used to bother her slightly but not cause a reaction are causing BIG reactions. She was probably always a bit nervous around other dogs, and now she's showing it. I recommend backing off her interaction with other dogs, so she's not practicing this aggressive behavior. No dog parks, etc. Then ask your veterinarian for a referral to a good trainer who can work with you on counter conditioning and desensitization to help Molly learn that other dogs aren't scary. This book is also very helpful if you don't have access to a trainer: https://www.amazon.com/Feisty-Fido-Help-Leash-Reactive-Dog/dp/1891767070

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