A lot of rodents have an odour about them, mostly it is not urine but scent glands. Tia has a funny musty smell, but you can only smell it when she's right near your nose. Generally, male rodents have a more pungent urine, and if you don't want a pet that smells too bad then it's best to have a female. That is why I am only allowed female rodents as my mum does not like their smell! But as others have said, the more you clean out the cage, and the more air freshener you use, the less the smell