How do you treat fleas on puppies?

Just use a flea shampoo and then a collar after wards or one of those flea prevention meds you add to their food.

Another option would be to start your puppy on a flea/tick preventative like Frontline, Advantage or Revolution. These medications, while expensive, also help control other parasites. If you have a severe infestation on your puppy or in your house, I suggest talking with a veterinarian or a professional pest exterminator.