Ctenocephalides canis

​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)

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Ctenocephalides felis

​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)

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Sources:
(1) Zajac, Anne M., and Gary A. Conboy. Veterinary Clinical Parasitology. 8th ed., Wiley Blackwell, 2013.