Characters » Jolteon
It evolves from Eevee when exposed to a Thunderstone.
Jolteon is a dog-like Pokémon with a very short tail, surrounded by a fringe of spikes on its rear, and yellow fur that can have the sharpness of needles (Glaceon shares this same trait, but it is not as obvious). Jolteon also has a white, spiky collar, and pink paw pads. Edit