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Why are my 9-month-old puppies suddenly aggressive at dog park?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Large (61lb +) | Male | unneutered | 1 year and 7 months old | 65 lbs

Hello my gf and I bought 2 sibling dogs and we use to take them to the dog park everyday but now we can't take them anymore because our girl dog gets to mean and she was never like this and when our girl dog gets mean to other dogs our boy starts to do it as well, like I said they have never done that and they are still puppies about 9 months we have been taking them since they were 4 months. I'm not sure on what to do. Thank you

1 Answer

Most Helpful Answer

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Answered By Jessica Desrosiers

Veterinary Technician

Published on October 13th, 2017

It's possible something startled one or both dogs at their last trip (playing too rough with a strange dog, getting nipped, etc) and that they're a bit more on guard. If your dogs are not spayed/neutered, hormones could also be coming into play, causing a change in behavior as they go through their teenage months. Taking small steps, such as playing near the park but not going in it, going to the park when there are fewer dogs that may cause stress, or even just finding other ways to play and interact, etc may help, however if the problem continues, a refresher course in a structured class with a trainer or working one on one may be beneficial in making sure Max and Ava stay on track for good behavior.

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