If you've ever wondered whether or not hamster pee smells, the answer is yes...and no. Hamster urine does have a distinct odor, but it's not necessarily unpleasant. Some people even find it to be somewhat sweet-smelling. However, if your hamster's cage is not cleaned regularly, the urine can start to smell bad. This is because ammonia builds up in the urine and creates a strong scent. If you clean your hamster's cage regularly, you shouldn't have any problems with odor.