I just took Devon and Amber for their first checkup and thedoctor was explaining pee color. White is okay.
Excess calciuim is what causes a rabbit's urine to sometimes dry whiteand chalky. Generally, white chalky urine residue is not a problem, anddoes not indicate sludge.
True sludge causes darker, grayish, thick and gritty residue. It is notclear why some rabbits develop sludge while others do not. For rabbitsprone to sludge and stones, it may be beneficial to reduce dietarycalcium, although dietary calcium is just one factor that might lead tosludge and stones. Genetics, water intake and infrequent urination,among other things, also can lead to this condition.