Eucyon (Greek: εὖ eu: good, true; κῠ́ων cyon: dog) is an extinct genus of medium omnivorous coyote-like canid that first appeared in the Western United States during the late Middle Miocene 10 million years ago.

[5] The jackal-sized Eucyon existed in North America from 10 million YBP until the Early Pliocene.

[6] Wang and Tedford proposed that the genus Canis was the descendant of the coyote-like Eucyon davisi, remains of which first appeared in the Miocene (6 million YBP) in the southwestern U.S. and Mexico.

[2]: p58 The recent discovery of the 5 million years old E. khoikhoi supports the proposed radiation of the genus Eucyon, with the oldest E. ferox in North America, to E. davisi in North America then to China, to E. debonisi in Western Europe, to E. khoikhoi in Africa.

[2]: p56 The fossil remains are found in the Rio Grande, Texas to western Oregon and Washington's Ringold Formation,[8] as well as northern Nebraska, along with Greece, Ethiopia, Mongolia and many other locations across the Old World.