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How to shower a puppy
Buy shampoo made specifically for dogs.
It's important that you don't use shampoo meant for humans on your dog. Some people think using baby shampoo is okay, but even baby shampoo contains certain chemicals and oils that shouldn't be used on dogs.
Use a shampoo marketed and made specifically for puppies. Try to avoid buying a puppy shampoo with any added non-natural fragrances and dyes.