During a flea infestation, treating your pet isn’t enough.You have to treat the environment too—that’s where the eggs and pupae are hiding. “I always tell my clients that killing the fleas on their pets isn’t enough. There are eggs and pupae in the carpet, in between the floor boards, and even in your car, if you have a habit of taking your dog on rides,” Morris says. Hohenhaus adds that if you vacuum during a flea infestation, you should immediately throw that vacuum bag out because any eggs and pupae you vacuum up may still be viable. “You also want to wash everything—bedding, clothes, etc.—in hot water,” she says. In the case of a particularly bad infestation, both Morris and Hohenhaus recommend enlisting the services of an exterminator.

BASIC ANATOMY OF
THE FLEA

A flea’s life cycle can be broken down into four parts: egg, larva, pupa, and adult. The adult lays eggs on a host, which then roll off into the environment. When these eggs hatch into larvae, the larvae hunker down in the environment, feed, and go through several molts until they spin a cocoon and become pupae. Eventually, from the pupae emerge adult fleas, which then seek out an animal host for a blood meal. Under ideal conditions, this entire process takes about 21 days. However, fleas have a very flexible life cycle, and will wait until conditions are optimal to move from one stage to another. “The more warm and the more moist it is, the faster the life cycle will go,” says Dr. Ann Hohenhaus, a staff doctor at NYC’s Animal Medical Center, who specializes in small animal internal medicine and oncology. “If it’s cooler and dryer, the process slows down until the temperature goes up.” 

LIFE CYCLE OF
THE FLEA

Cat Flea
Dog Flea
Bird Flea
Human Flea
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