anamals dont have rules and arent likehumans we are clean relitvly (except when it comes to desroying theearth) when we go to the restoom we flush it away. most animals havemuch stronger sences of smell , they use their noses to gatherinformation and your bunny smelling his urine is probably a carriedover trait from wild bunnys. pee can tell a bunny lots of things. hewas just checking if another bunny passed by.