I'm having a bit of trouble with my dwarf-cross male. He isn't neutered and he has a friend, plenty of toys and a huge run in the garden. However he keeps over grooming the areas around the knee. The are isn't crusty and doesn't appear to be inflamed. He has been seen by my vet who checked for parasites and mites and none where found. He was prescribed some Dermisol cream and initially the areas healed up nicely and had good hair regrowth. Unfortunately he started excessively licking again and the areas are now larger than ever before. He seems to do it when him and his friend get particularly excited ( both of them are I neutered males ) . I would really appreciate any advice anybody can offer me!!