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Why is my 3-week-old kitten constipated and urine smells like eggs?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | 21 days old | 0 lbs

Hello! We have a 3 week old foster kitten that I have some questions about. First off, he hasn't goon poop in a few days, which is about when the other problem started. His urine smells like rotten eggs. He's still acting normal, just a little bloated from not going potty. Any idea what the issue might be? Diet?

1 Answer

Most Helpful Answer

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Answered By Jeffrey Milner

Veterinarian

Published on April 28th, 2017

Usually, kittens over three weeks old no longer require physical stimulation to urinate and defecate. However, there is some variation in this number and it is possible that Milo is on the late end of that variation. I would try and stimulate the anogenital region to see if this can create a bowel movement. This very well may be the cause of the bloated appearance you are seeing currently. As for the urine, in my experience, cat urine never smells too great. However, a rotten egg scent could be an indication of some type of urinary tract infection or unbalanced pH of the urine. It might be worthwhile having Milo checked out by the vet. If you can, I would bring in a urine sample too to have it analyzed for any problems include bacteria or white blood cells. I have not heard of diet causing that kind of scent in the urine in cats, but I suppose it is possible. A three week old cat should not be eating much of anything other than KMR or the very beginnings of cat food in gruel form.

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