Meniscotherium

Meniscotherium is an extinct genus of dog-sized mammal which lived 54-38 million years ago. It was a herbivore and had hooves. Fossils have been found in Utah, New Mexico. and Colorado. Many individuals have been found together, indicating that it lived in groups.[1]

Body mass in M. chamense is estimated to be 5-17 kg, making it about the size of a small dog.[2]

A 2014 cladistic analysis places it within stem perissodactyls.