Mesocyon is an extinct genus of dog (family Canidae) which inhabited North America 34 Mya to 21 Mya, described by William Berryman Scott in 1890. Mesocyon was a member of the extinct subfamily Hesperocyoninae, which includes the earliest canids. It was the most basal member of a clade that also includes the genera Cynodesmus, Sunkahetanka, Philotrox, and Enhydrocyon. Like other members of this group, Mesocyon had a hypercarnivorous dentition, indicating that its diet was almost exclusively meat… (More on Mesocyon)