changing color of fur

Question
hi um my rabbit bubba is a holland rabbit and hes tanish colored and all tthe sudden i  noticed today that hes changing to dark gray and i dunno y this is happening is he going through fur loosing or gaining?

Answer
There are some rabbits in which the color of the fur does change.  I have one of those and her color has changed multiple times during her life.  He is probably going through a molt and the new fur color is coming through.  I'm not sure why some do this more than others.  Sometimes exposure to sunlight changes the fur color, sometimes it's genetics.  But it's nothing to worry about.