I just found out something interesting. I've never tried it, but it's supposed to work. If you want or need to give your cat or dog a flea bath, add a little bit of 3% hydrogen peroxide to the bath water and it will kill the fleas immediately. How much is a little wasn't specified, but I suppose it would depend on the amount of water you are using for the bath. Just thought I'd pass it on if anyone wanted to try it.