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allerdog@yahoo.com it is allergies -- I have an allergy yorkie too. how old is yours? I recommend switching asap to natural balance fish and sweet potato. If chewing backside it can be flea allergy- have you seen fleas on him? The allergies can be food, environmental or flea or combo of all - in most cases it is environmental. Use a hypoallergenic shampoo like earthbath hypoallergenic or dr. bronners unscented mild baby shampoo as many can be allergic to oatmeal shampoos