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Why is my dog suddenly aggressive and barking after neutering?

Updated On September 23rd, 2025

Pet's info: Dog | German Shepherd | Male | neutered | 4 years and 1 month old | 100 lbs

Before being neutered, my 3 year old GSD never barked and was calm around other dogs. Right after though he started lunging and barking at passing dogs on our walks. Our very says neutering only reduces agression and doesn't believe me. Is there a way to get him back to his old calm behavior?

1 Answer

Most Helpful Answer

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Answered By Lindsey Edwards MVB, BSc, IVCA

Veterinarian

Published on April 22nd, 2019

Testosterone is mood balancing and very occasionally in timid dogs castration can heighten anxiety and aggression. I would recommend working with a certified behaviorist to try and work through this and possibly medications may be required if not settling

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