I was able to give my boys (neutered male dogs) the chewable pill that kills fleas, and also gets rid of worms and heartworms. They seem to be doing better, but both are still scratching some still. The Boston is pregnant, so she can't have that, and they told me to try Advantage, since Frontline was not doing anything. Advantage is not any better. The only time she's not scratching is when she is sleeping, and she wakes to scratch then, too! I guess maybe she's getting a little bit better each day. I will not let puppies go that have fleas, I will figure something out. Going to fog the dog shed (it's about 10x14 and I can fog that before anything gets put in there) before she goes out there for whelping. Going to put a window AC unit in there, just a really small one, as the building is insulated, then figure out some type of doors that they can come in and out of, and all the dogs will have AC available to them during the day! Shouldn't cost too much to run, at least I would hope not, since it will be 110 V, and the AC will be in a north window, so no sun beating down on it all day. We shall see .... AC units are on sale now, too, so good time to buy.