>>56440471Eevee's creator mentioned wanting to create a "blank slate Pokémon" and drew inspiration from vague memories of a "fluffy cat or dog-like creature" he saw as a child.
Eevees and Eeveelutions are meant to look ambiguous enough that you can them cats, dogs or maybe even foxes and still be just as "correct". Espeon being the one who leaned too much into the "cat" side of the spectrum.