Bud and Lou are villains in Krypto the Superdog. They are the pet hyenas of The Joker and are the enemies of Ace the Bat-Hound and Krypto.
They excel at setting dangerous traps and are not intimidated by Ace or Krypto. They have also battled Streaky the Supercat. Since they both look the same Bud wears a purple collar and Lou wears a green collar. They once teamed up with Isis.