Fleas can be a big problem for dogs and cats, especially during summer months, but there is a bigger problem: the commercial chemical-laden treatments that–in my opinion–do more harm than good. Flea collars, sprays, powders, shampoos and the like may be mildly effective, but the dangers outweigh the benefits. As your skin does, your pet's skin absorbs everything you put on it, so topical treatments make their way into the bloodstream. If the products are filled with chemicals (most of them are),
