The cat in my avatar had food allergies and she would lose her fur on her back legs, butt and lower back. Losing fur and licking seems to be one way they show it. Your poor kitty is probably itchy!
These shots were all from Cheezeburger and most of them. IMO none of these appear to be photoshopped. Most look like natural shots, a few possibly set up, but a most of them were probably just quick shots before the cat went postal on them.