Arctic fox
Looking at the most recent phylogeny, the Arctic fox diverged from the domesticated dog ("Canis lupus familiaris") at approximately 12 MYA. The Arctic fox and the red fox ("Vulpes vulpes") diverged approximately 3.17MYA. Additionally, the Arctic fox diverged from its sister group, the kit fox ("Vulpes macrotis"), at about 0.9MYA.