Which works better, a flea collar or drops, and which company? Is there anything out there that kills eggs as well as fleas? I have been able to find and kill a lot, but my puppy has such long fur that they can hide easily. He’s only six months old, and I don’t know if any products are not supposed to be used on puppies. Are eggs visible?

While I’m at it, how old should my dog be when I switch from puppy food to adult food.