Temporal range: Early Oligocene–Early Miocene
Mesocyon is an extinct genus of terrestrial carnivore within the family Canidae, subfamily Hesperocyoninae, which inhabited North America from the Early Oligocene 33.9—20.6 Ma, existing for approximately .
Mesocyon was the most basal member of a clade that also includes the genera Cynodesmus, Sunkahetanka, Philotrox, and Enhydrocyon. Mesocyon was named by Scott (1890). It was synonymized subjectively with Enhydrocyon by Swisher (1982). It was assigned to Canidae by Scott (1890), Carroll (1988) and Stevens (1991).
Two specimens were examined by Legendre and Roth with the first specimen's mass being estimated at 7.4 kg (16.3 lbs). The second specimen's mass was estimated at 7.19 kg (15.8 lbs).
- PaleoBiology Database: Mesocyon Taxonomy, Species
- R. M. Nowak. 1991. Walker's Mammals of the World. Maryland, Johns Hopkins University Press (edited volume) II
- Q. Ji, Z.-X. Luo, C.-X. J.R. Yuan Wible, J.-P. Zhang, and J.A. Georgi. 2002. The earliest known eutherian mammal. Nature 416:816-822
- Wang, X. 1994. Phylogenetic systematics of the Hesperocyoninae (Carnivora, Canidae). Bulletin of the American Museum of Natural History, 221:1-207.
- S. Legendre and C. Roth. 1988. Correlation of carnassial tooth size and body weight in recent carnivores (Mammalia). Historical Biology
- Paleobiology Database: List of taxa; California
- Paleobiology Database: List of taxa; Tremain, Wyoming
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