mine as well, they do come in little spots like that but that's about it. If that is all that he is peeing you should get him to a vet, if he is litter trained check his box to see, if not find where he normally pees and see. Good luck to you and your bunny!I think it should be okay. I’ve found that my rabbit has some discoloured urine on rare occasions. If it happens again soon, it might be something to have checked out by a vet.