In order to effectively control an infestation, fleas must be removed from the pet, the home, and the yard. Removal of fleas from the animal alone is futile. Immature fleas which have developed into adults off the animal simply jump on, causing subsequent reinfestation. Flea combs may be used to treat the pet, yet they only remove ten to sixty percent of the fleas. By shampooing the animal, the dried blood and skin flakes which provide food for the larvae are removed.
Shampoos contain certain pesticides such as pyrethrins, carbamates, and citrus peel derivatives.
Pennyroyal oil, another natural product, is also available in shampoos. Pulegone, the active ingredient in the oil has dose related toxicity to mammals and may induce lethargy, vomiting, diarrhea, nose bleeds, seizures, and, possibly, death due to liver failure. When using a pesticide, always consult the label. Scientific evidence regarding dietary supplementation with vitamin B, Brewer s Yeast, or garlic suggest these methods are of little value. Scientific evidence has also shown that ultrasonic and insecticidal flea collars are not very effective.