It may sound weird, but many dogs are allergic to rice. I was having difficulty with my dog's skin until I read an article about dogs and rice. I asked my vet and he suggested a dog food, the name escapes me but it is a science diet made of fish and potato. It stinks something aweful, but my puppy loves it and his skin has cleared up. If you look at dog food, and treats you will be surprised how often rice is one of the ingredients. Hope this helps.