Light Dog, Dark Dog, Black Dog
Mayura finally decides to get the one thing she's sure will help transform her into the ultimate mystery solver; a dog! When sets out to find one, a puppy literally falls out of the blue and at her feet. But this black pup probably won't be sniffing out criminals any time soon... or will he? This new dog isn't all he appears to be... Meanwhile, Loki's investigating mysterious blackouts that are occurring over town. How are the blackouts and the black dog connected?
Aired 05/07/2003EP 14 - Light Dog, Dark Dog, Black Dog

Mythical Detective Loki Ragnarok
Loki, the Norse god of mischief, has been exiled to the human world for what was apparently a bad joke. Along with being exiled, he's forced to take the form of a child. He's told the only way he can get back to the world of the gods is if he can collect auras of evil that take over human hearts, and so to do this he runs a detective agency. Loki is soon joined by a human girl named Mayura who is a maniac for mysteries, and she soon helps out in her own way. However, soon other Norse gods begin to appear, and most have the intent to assassinate Loki for reasons unclear.
(Source: Anime News Network)