We have a few does putting out dark orange urine. Is this normal? We've seen every shade of yellow but this dark orange was surprising. At first we thought it might be stain from the wood on the hutch area but we confirmed that it wasn't.
It seems to be a temp sensitive thing-- squirrels and wild rabbits do the same thing. I am guessing, that as fresh water intake drops, the animals probably concentrate their urine, as a way to conserve body water levels. Our domestic rabbits continue the process of water conservation, simply because their bodies don't know any better.