Fleas are the most prevalent ectoparasites found on dogs and cats. For most small animal practitioners, flea-related health problems are number one. While a mild infestation of fleas is not significant clinically, the associated dermatitis, tapeworm infection, hemobartenellosis, and anemia are the major health problems.
Dermody, Teralyn Sanders and Noxon, James O.
"Fleas: Related Health Problems and Control,"
Iowa State University Veterinarian: Vol. 51
, Article 12.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol51/iss1/12