Foul Smelling Urine in healthy neutered rabbit?

Question
Hi. My neutered, litter trained, male bunny is 2 years old and seemingly healthy. There has never been an odor issue with his cage, but a few days ago his urine started to smell very strongly.  I changed the cage but the next day it smelled awful again, and when I came home from work today the entire house reeked like a dirty diaper. I didn't see any wet droppings or signs of diarrhea. His activity seems normal and he seems to be eating and drinking normally.

I should tell you that he's an expert at getting into purses and backpacks that aren't hung up --and has consumed quite a bit of chewing gum over the past year. (believe me we try to be very careful but he's amazingly tricky.

Thank you very much

Answer
Dear Margo,

Rabbit urine can have a strong smell in an un-neutered/unspayed bunny, but a really stinky, nasty smell usually spells urinary tract infection.  Please get bun to an experienced rabbit vet:

http://www.rabbit.org/vets

and please read:

http://www.bio.miami.edu/hare/urinary.html

Sometimes a rabbit will show no sign of pain or discomfort with a UTI, but you can sure smell it.

I hope this gets you on the track to solution of this problem.

Good luck,

Dana