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How long until my dog's behavior changes after neutering surgery?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Small (up to 22lb) | Male | unneutered | 2 years old | 10 lbs

If I get my dog neutered how long will it take to see a difference in behavior? He"s supposed to get neutered on 8/22/17

3 Answers

Most Helpful Answer

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Answered By Dr. Macartney, BVet Med, MRCVS

Veterinarian

Published on August 1st, 2017

The only behaviors that will be affected by castration are those that are under the influence of male hormones. So for example, a dog’s temperament, training, and personality, are related to genetics and upbringing, not hormones. Neutering does not “calm” an excitable dog, and unless a castrated male dog is overfed or underexercised, there is no reason for it gain weight or become inactive. The undesired traits which are related to male hormones such as sexual behaviours, aggression, and urine marking will change over the course of a few days to a few months. I hope that is helpful information and I wish you the best of luck with Nipper's surgery.

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Other Answers

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    Answered By Dr. Davis

    Veterinarian

    Published on

    Generally it takes about six weeks after neutering for the male hormones to decrease. Depending on the behavior you are asking about I recommend using this time to retrain Nipper in the appropriate way you wish him to act. Thank you for using Petco Pet Education Center, formerly Petcoach to help you care for Nipper.

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    Answered By Jenna Beyer, DVM, MBA, cVMA

    Veterinarian, Certified Veterinary Acupuncturist

    Published on

    It depends on what behaviors you are concerned with. Not all behaviors will change just from neutering. Try asking a more specific question and we can answer you better! Or ask for a consult to discuss this fully.

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