The dhole's distinctive appearance has made it difficult to say which other species in the dog family it is most closely related to. George Simpson suggested the dhole, African wild dog and bush dog were in the same subfamily ("Simocyoninae") because all three species have similar teeth. However, other biologists such as Juliet Clutton-Brock found that dholes' bodies had more similarities with dogs in the genera "Canis", the Falkland Islands wolf, and the Arctic fox than the African wild dog and the bush dog. The similarities dholes share with African wild dogs and bush dogs are coincidental.