Dry Skin Problem

Hi, my new Aussi puppy has been scratching and biting herself a lot and also seems to have a bit of dandruff. I was just wondering if she might be allergic to her food. She is currently eating Purina One, which was provided by the breeder, but I find it isn't high in protein. Do you think I should change her food to Acana for puppies or would that not fix her dry skin problem? I also hear that foods with fish in it makes for a better coat and skin, is that true?

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