Myacyon is an extinct genus of large sized carnivoran mammals, belonging to the family Amphicyonidae (“bear dogs”), that lived in Africa during the Miocene epoch.

Due to the limited scope and fragmentary nature of the severely damaged holotype, as well as the illustrations in its descriptions, which have been called inadequate, usage of this genus poses serious issues.

[3] Its relationships to other amphicyonids are obscure, and it is not closely related to Bonisicyon, the other late surviving African genus, although it has been proposed that it descends from a species of Cynelos[4] or Namibiocyon.

[5] The genus was erected in 1992 on the basis of a severely damaged and fragmented distal half of a right mandible containing m1-m2, and a not yet erupted m3, found at the locality Oued Mya in Algeria.

The dimensions of Myacyon dojambir and the m2 from Napudet approach those of the largest Amphicyon giganteus and the enormous Cynelos jitu, which have been estimated to weigh over 300 kg,[5][15] although the material from the Samburu Hills[13] and Beni Mellal is considerably smaller.

[6] M. kiptalami is as large or slightly larger than a lion,[7] and the remains from Kipsaraman, Bled Douarah and Lothagam suggest a similar size,[2][10] ?M.

peignei is not nearly as large, being smaller than most Early Miocene species of Cynelos, except for C. euryodon,[4] itself comparable in size to the 42 kg[16] heavy C.

The paraconid is indistinct and separated from the protoconid by a very weak notch, which is visible on the buccal margin of the anterior crest, while the metaconid is reduced and situated slightly posteriorly.

[6][12] The cranial remains of M. kiptalami superficially resembles those of large felids and nimravids, with a short snout, enlarged canines and long diastemata.

As a result of these adaptions, Myacyon had a considerable gape, with canine tips extending 40 mm beneath the occlusal surface of the carnassial and incisors.

[22] The locality shares many taxons with the Ngorora Formation, among them Afrochoerodon, Climacoceras, Chilotheridium, Gentrytragus, Kipsigicerus, Dorcatherium and Kenyapotamus.