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Zeuter failed? My dog's testicles grew back, now aggressive.

Updated On September 23rd, 2025

Pet's info: Dog | Siberian Husky | Male | neutered | 5 years and 8 months old | 60 lbs

My husky underwent zeuter at 9 mos. He is now nearly 6 years old and his testicles look to have increased back to normal size again. He's also exhibiting increasingly aggressive alpha behavior, marking everywhere, and has started getting into fights with other intact males. Is it possible that the Zeuter was reversed? This doesn't make sense to me, but I'm concerned as we live in an urban area and around a lot of dogs.

2 Answers

Most Helpful Answer

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Answered By Amy S. Eutsey, DVM

Veterinarian

Published on July 2nd, 2018

Hello. Since “zeutering” is a chemical sterilization and the testicles are not actually removed, it may be possible for them to still be active. If enough functioning tissue remained, there may still be hormone production. I would contact the veterinarian that performed this procedure as it is not widely done and not much long term info is available on dogs that have problems years down the road.

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    Answered By Laura Johnson VMD

    Veterinarian

    Published on

    Hi, thanks for using Petco Pet Education Center, formerly Petcoach! This is very abnormal. During a neuter the testicles are removed and they can not grow back. I wonder if he was cryptorchid and they only removed the descended testicle in the scrotum and never went after the retained one. And now it descended. Even that is a very unusual thing. The behavior he is exhibiting may or may not be related to hormones. A lot of dogs reach social maturity around 3 years of age and can show new behaviors. The swollen scrotum requires a vet exam to tell for sure if it is a testicle, an infection or ever cancer. I would also bring a urine sample. If he is intact we tend to see sperm in the urine sample. Good luck!

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