I know this is a last late chime in but being experienced in behavioral issues and owning spoos, I did notice that after grooming, if the clip is close to the skin, especially on tail to make that big poof, or hind end, my dogs would chase after their butt. Like they feel air for the first time. Or RAZOR BURNED. Surprised!?! Whenever clips are short. Feet especially, they acted weird. I started powdering them with Gold Bond Medicated powder, a good sprinkle and massage, It stopped. You can try a hydrocortisone cream too. My Vet recommended the cream. The powder worked though. If they persist with the behavior, it becomes neurotic, OCD, whatever you label it. They develope a self-soothing sort of thing that becomes a behavior. Like sometimes they lick and lick after they have blood draws on their arm, they can get a sore scarring. Finding the reason for it is the biggest challenge. If he started it after a grooming, try the Gold Bond. Even now, try the Gold Bond. It won't hurt. Hope this helps.