A. This could be a sign of an allergy to some ingredients of the new food, but also could possibly have other reasons such as parasites (fleas, mites, etc). At this age you should be doing flea prevention. Inspect the new food (if it is dry food) with a magnifying glass, if you have one, and look for movement. There may be food mites that can also cause itching in a dog. Sometimes puppies can also get a bacterial skin infection that is itchy. Your puppy is due for vaccines anyway, so discuss this with a veterinarian. In the meantime, if you really think this is caused by the new food, stop feeding it and go back to the old food.
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