it refers to foxes

C. vulpine

As the term vulpine is associated with the characteristics of a fox, the word feline is associated with the cat.

Vulpine is something that is in relation to a fox species. It can also be used to describe someone/something that is sly, cunning, or crafty.

Bre swept in and stole Casey's entry pass with vulpine dexterity.

or

With her vivid green eyes, [porcelain skin, and silky deep red hair, Sasha possessed a striking, vulpine beauty.