Fox is a white creature type used for cards depicting carnivorous mammals, characteristically having upright ears, a pointed snout, and a long bushy tail. Foxes are related to dogs and wolves.
For a long time Arctic Foxes from Ice Age was the only existing Fox card. This changed when the Kitsune from Kamigawa were introduced.
After Innistrad added the Silverchase Fox and Theros Vulpine Goliath, the creature type became more common.
Even though this fox-folk live within the Jukai Forest, the have the closest relations with the humans.  Even more so than the daimyo's Soratami advisors. Kitsune are long-lived beings with very strong beliefs in their traditions. The Kitsune always have a class beside the Fox subtype.