Arctocyon ('bear dog') is an extinct genus of ungulate mammals. Arctocyon was a "ground dwelling omnivore", that lived from 61.3-56.8 Ma. Synonyms of Arctocyon include Claenodon, and Neoclaenodon.[1] Arctocyon was likely plantigrade, meaning that it walked with its feet flat on the ground, rather than on its toes.[2]