Bat Hound

Bat Hound is a minor super-hero animal who is a parody of Krypto. He doesn't appear much in the series after his first episode appearance in the Lego Batman Youtube Series.

Character Biography
Bat Hound appeared in Lego Batman Episode 4, as a new sidekick of Batman who was supposed to "spiff-up" the Batcave. Batman picked Bat Hound as his sidekick because of his sense of "finding and picking-up clues." However, Bat Hound doesn't go with Batman and Bat Girl in their first quest, and instead stays at the Batcave with Robin, who tried to train him into being a super-hero dog. But instead Bat Hound viciously attacked Robin

New Sidekicks
After viciously attacking Robin in the Batcave, Robin asked Alfred to help him train Bat Hound. Alfred said he does not know how to train one, but that he does know how to kill one by "accident." Robin refuses to do because Alfred's murder plan, in Robin's eyes, was a "sexual thing." So Bat Hound remained alive, and attacked Mr. Freeze when Robin came to save Batman and Batgirl, who were tied-up.

Trivia

 * Bat Hound appears at the credits at the end of two episodes. However, the reason why this is so is unknown.
 * Bat Hound parodizes Krypto from Super-Man because like Krypto, Bat Hound is Batman's animal sidekick.
 * Batman once mentioned Bat Hound when saying, "Oh yeah my dog pees on it. He has quite the bladder problem."