They bite, they jump, they feed on their own feces! The Flea!
Fleas are blood feeders that commonly come inside by hitching a ride on your dog or cat when they go outdoors. Even if you have no pets fleas are occasionally brought inside on rats or mice living in your crawlspace or attic. Once inside adult fleas can drop off and live under beds and couches, in the nap of carpets and other floor levels cracks and crevices.
The key to flea control is to treat your pet first, then have a professional flea treatment done using an insect growth regulator to cut off the flea life cycle in your home. In the meantime your best defense is regular laundering of pet bedding (and your bedding too if your pets sleep on your bed) plus vacuuming to remove fleas, their larvae and pupae and “flea dirt”. Flea dirt is the droppings of adult fleas – this contains partially digested blood and it is what the flea larvae eat. Yum!