Pepsi has this odd sore on his paw and of course he won't stop licking it. It seems to be getting bigger, I think mostly because he's messing with it a lot. It appears moist in the photo, but that's just because we applied an antiseptic and it was still wet (boy was Pepsi ticked at us!). It doesn't seem to affect him in that there is no limp and he's running and jumping as is normal for him. His claws seem normal when we press on his pads to extend them (although somewhat dark as though the kitty litter has stained them...?). Has anyone seen this or something like it before? Thanks for all your help!