The Sardinian DholeCynotherium sardous was an endemicinsularcanid, that occurred on the Italian island of Sardinia and the French island of Corsica (the two were joined for much of the Pleistocene). It became extinct when humans began to settle on the island.
When this canid became confined to the island, it faced a menu consisting of small and fast prey only.
It appears that Xenocyon is the ancestor of Cynotherium. Sometimes it is also considered a derivation from a population of late Canis arnensis (or Canis mosbachensis).