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Fleas

Usually mildInfectious

Also known as: Flea infestation, Ctenocephalides

A common external parasite. Beyond intense itching, fleas can trigger allergic dermatitis, transmit tapeworm and Bartonella, and cause anemia in puppies or heavy infestations.

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Symptoms to watch for

How it spreads

Picked up from infested animals, bedding, carpets, yards, or wildlife. Fleas jump onto a host and reproduce rapidly in the environment.

Prevention

Year-round flea preventives, washing bedding in hot water, and treating the home and yard. Treat every pet in the household at once.

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Educational information only — not veterinary advice. If you think your dog is sick, contact your veterinarian.