AnimalOne of the first comparisons that people make with all Eevee evolutions are to the Red Fox. Red foxes are the largest of the fox family, and are true carnivores. Apart from its large size, the red fox is distinguished from other fox species by its ability to adapt quickly to new environments. Red foxes are usually together in pairs or small groups consisting of families, such as a mated pair and their young, or a male with several females having kinship ties. I found that fact very interesting because we often see groups of Eevees and their evolutions together throughout the anime series.
The other animal that can be compared to Leafeon is a Siamese Cat. Siamese literally means "moon diamond," as it matches the color of their fur. The modern Siamese is characterized by blue almond-shaped eyes, a triangular head shape, large ears, an elongated, slender, and muscular body, and point coloration. I feel like that describes the body shape of Leafeon almost perfectly, minus its special markings.