I am having the same problems with both my cockapoos. I have had them to the vet several times. Ar first the vet said it could be allergies. After changing food, treats favorites blankets etc, the problem still persists. I check the areas where they are biting and there is nothing there. No lesions, fleas.....nothing. It is really becoming annoying. I found this site while looking for advice from others about the same issue.