Finding fleas on a rabbit can be difficult due to their thicker fur.  The fleas can hide pretty well burrowed deep down in the fur.  If you notice tiny specks on your rabbits fur that look like dirt, they could be flea poop, also called flea dirt.  To confirm whether the speck is actually flea dirt, put it on a napkin and add a tiny drop of water over it.  Blood will appear in the form of a red ring around the spot if it is indeed flea dirt. Itching is another sign of fleas in rabbits.  If you notice your bunny scratching themselves more than usual or see sores or missing fur from excess itching, it may mean that they have fleas.