"Eevee is a mammalian creature with brown fur, a bushy tail that has a cream-colored tip, and a furry collar that is also cream-colored. It has four short, feline-esque legs with three small toes on each foot. Eevee has brown eyes, big ears, and pink paw pads. It has traits of rabbits, raccoons, foxes, dogs, and cats."
Eevee and the eeveeloutions are usually accepted to be based off of either a fox (Eevee, Jolteon, Umbreon) or a cat (Espeon, Glaceon, Flareon, Vaporeon), depending on the form.