Neutered cat and testosterone hormone levels


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Our question this week was:

I adopted a cat that was three years old and was never neutered. I got him neutered right away. How long does it take for the testosterone to get out of his body? I had him neutered approximately 6 weeks ago. He is still going after one of my spayed females and he has gone after my male dog.

Barbara Smith


Hi – thanks for your email. Great question. It can take several weeks for the testosterone to leave a cats system after they are neutered. Some cats can still "breed" immediately after they are neutered as they will still have sperm in their systems.

However, some cats that are adults when they are neutered will maintain a desire to try to breed other cats. Neutering will eliminate the cat's ability to get the female pregnant but it may not eliminate the desire to mate. Every cat is different. Generally, given enough time, the behavior will dissipate.
An article that might be helpful to you is on our is Mating Behavior in Cats.

Best of luck!

Dr. Debra

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debra-primovic Dr. Debra Primovic

Debra A. Primovic, BSN, DVM, Editor-in-Chief, is a graduate of the Ohio State University School of Nursing and the OSU College of Veterinary Medicine. Following her veterinary medical training, Dr. Primovic practiced in general small animal practices as well as veterinary emergency practices. She was staff veterinarian at the Animal Emergency Clinic of St. Louis, Missouri, one of the busiest emergency/critical care practices in the United States as well as MedVet Columbus, winner of the AAHA Hospital of the year in 2014. She also spends time in general practice at the Granville Veterinary Clinic. Dr. Primovic divides her time among veterinary emergency and general practice, editing, writing, and updating articles for, and editing and indexing for veterinary publications. She loves both dogs and cats but has had extraordinary cats in her life, all of which have died over the past couple years. Special cats in her life were Kali, Sammy, Pepper and Beanie.