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					Originally Posted by Magnus  If you've ruled things out and he's still scratching/biting like that, then I think the best thing is for you to take him to the vet.  Have you been using the flea combs to check him?  It also might be a seasonal thing.  
 If you cut out all the treats, chews, environmental and he's still like that.. It could be the food.  What are you feeding him?  I think there are chances where dogs develop allergies just like humans.
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  I haven't been checking using a flea comb, but having said that, his hair is pretty thin and fair, so it has been easy to locate the little buggers.
The food that I have been feeding him is Iams for small dogs.  Going out now to search for a better food with no corn, as I understand that Yorkies can have an allergy to this.