They spread through homes, buildings, and yards, and attack pets, livestock, poultry and people. Pets infested with fleas are painfully annoyed, and scratch and bite themselves almost constantly. Their coats become soiled and roughened, and their skin becomes irritated.
Dogs often get severe flea allergies.
The dog flea and the cat flea are the most widespread and abundant. Both attack dogs, cats, and humans. The female adult lays eggs on an animal or in its sleeping place. The eggs fall off the animal and, within a few days, hatch into larvae. The pupae change into adults in about 1 week and emerge from the cocoons.