Aelurodon taxoides. Illustration and photo-reconstruction of the extinct North American dog running through woodland. Aelurodon, in the subfamily Borophaginae, lived from the Barstovian land mammal age (16 Mya) of the middle Miocene to the Clarendonian age of the late Miocene (9 Mya). Aelurodon taxoides lived from 13.6 -5.33 Mya (8.27 million years). Fossil specimens were found in Florida, Texas, New Mexico, Kansas and the bay area of California. Two specimens had an estimated body mass of 56 kg and 49 kg. The name Aelurodon was given by Joseph Leidy in 1858. As Aelurodon evolved its teeth adapted to a more purely carnivorous (hypercarnivorous) diet, a trend consistent with other borophagines.