Petco Text Logo
Petco Pet Logo

Why does my unneutered male cat have yellow stool and ammonia smell?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | unneutered | 5 years and 6 months old | 10 lbs

We have a 5 yr old male cat, not fixed, some yellow stool, recently strong ammonia smell from litter box no weight loss, he's generally moody anyway, so hard to tell about behavior change.

1 Answer

Most Helpful Answer

Image profile

Answered By Mirissa Duncil, DVM

Veterinarian

Published on July 30th, 2017

Hi and thanks for using Petco Pet Education Center, formerly Petcoach! The strong ammonia smell is likely due to the urine being concentrated (not diluted by water intake). Male cat urine also has a special "scent" for marking. Neutering will help with this. The yellow stool will require a fecal from your veterinarian to check for parasites. Hope this helps!

Vote icon

1Pet Parents found this answer helpful

image
Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Sponsored