It does sound like possible allergies.. some people will switch to the duck and potato food.. A lot of companies are coming out with foods that are very simple and limited. So if it is an allergy to food should do the trick.. The biggest allergens in food are Wheat, corn, soy and by products so read the food labels.. might give you a clue.
I'm sure there will be some other great advice too.
Let us know how it goes.
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