My aunts Belgien Turverian is a little neurotic. He's from pedigreed champion lines, but He will lick his back right foot when he is uncomfortable, nervous, bored, or sometimes for no reason we can figure out. He will lick it raw. They've been to the vet his whole life for this problem, and so far the best thing for him is to engage him in an activity. He is diagnosed with some mental disorder that they give him meds for when he goes wacko, so there could always be something underlying emotionally [mentally] that they may not be aware of. I hope everything works out for him, and hopefully it's something that can be fixed.