#2 Dog Fleas
The scientific name for the common dog flea is Ctenocephalides canis. Despite the name, this flea will not only affect dogs, but also cats, humans, and other animals. The dog flea is also commonly found on wild animals, such as raccoons and opossums, and on livestock. Both cat and dog fleas are carriers of the common tapeworm parasite, which affects both dogs and cats.