This information is educational and, frankly, a bit creepy regarding fleas and if they can live in human hair. Some facts are about real dangers, maybe more than you think.
The cat flea Ctenocephalides felis is the most common to affect dogs and cats in America. The truth is, cat fleas can affect dogs, and dog fleas can affect cats, but dog fleas exist mostly in Europe.
This flea is the most common flea found on pets and other domestic animals in the United States. It can spread plague bacteria but does so inefficiently compared with a ground squirrel or rat fleas.
Dipylidium caninum, a tapeworm commonly found in dogs and cats but occasionally found in humans. The dog flea is not a common flea of the domestic dog in the United States.
It is frequently associated with ground squirrels, including California ground squirrels and rock squirrels, which are known to aid in the spread of plague bacteria to people in the United States.