My vet recommended johnson n johnson baby shampoo to kill fleas on puppies I had once that were too young to use regular flea shampoo on. Also sprinkling garlic on their food helps keep off fleas. I havent used anything but the garlic on my animals in the last three yrs and haven't had a single flea as of this day. Don't put too much garlic in their food though, because it can cause them to have thin blood which is dangerous if they get cut etc. It also can upset their tummies. So just a sprinkle on their meals is good.