Can cat fleas live on dogs?

Yes, cat fleas (Ctenocephalides Felis) can live on dogs. Cat fleas are not host-specific, and while they generally prefer to feed on cats, they can also feed on other animals, including dogs, humans, and other mammals. In fact, cat fleas are quite common on dogs, and any pet can easily get fleas if they come into contact with an infested cat. So if your cat or another animal has fleas, your dog is also at risk of getting fleas.