Don't worry My rabbit pees all sorts of colors, but if you're really concerned get him checked out for an exam its about $25.00-$35.00. They'll feel your rabbit for anything that might be harming him. I have a girl and she pee's red and creamy white. I was really scared so I brought her to my vet, they said that it is normal for rabbits to do this in their diet. If you see any signs of your rabbit hurting when urinating take to a vet immediately.
-Kat
-Kat