Character Description: Raikou
Raikou is like Entei, the legendary Dog Pokemon. He shown in one of the Pokemon episodes as a shadow. Like most Thunder Pokemons, Raikou is very fast and most likes escapes from battle.
His name comes from Japanese words Rai and Kou, Rai meaning Thunder and Kou meaning Lord. He looks like a sabertooth tiger with a ninja mask and a thunder looking tail.
Some think the three legendary beasts are dogs, but it's much more likely they're from the feline family seeing as how Entei looks like a lion and Raikou looks like a tiger.