Ctenocephalides canis
(aka., Dog Flea)
Distinguishing Features: Genal comb and pronotal comb; Genal comb of ≥5 spines; Eyes present; Head length <2x head height; Spine 1 of genal comb distinctly shorter than spine 2 (1)
Ctenocephalides felis
(aka., Cat Flea)
Distinguishing Features: Genal comb and pronotal comb; Genal comb of ≥5 spines; Eyes present; Head length ≥2x head height; Spine 1 and spine 2 of genal comb approximately equal in length (1)
Sources:
(1) Zajac, Anne M., and Gary A. Conboy. Veterinary Clinical Parasitology. 8th ed., Wiley Blackwell, 2013.
(1) Zajac, Anne M., and Gary A. Conboy. Veterinary Clinical Parasitology. 8th ed., Wiley Blackwell, 2013.