Everyone who wrote in got this correct, despite the fact that the flea wasn't really staying still. We eventually took Blaine's advice and killed it (by placing it in ethanol). We then mounted it on a slide and got a much clearer picture of the flea, showing the genal and pronotal combs that are characteristic for Ctenocephalides species:
The dog and cat fleas (Ctenocephalides canis and C. felis respectively) can be further differentiated based on the shape of their head and "tooth" length of the genal comb.
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