How to unlock the h-hog hamster in petz hamsterz 2 DS?

Unfortunately, there is no "H-Hog" hamster in Petz Hamsterz 2 DS. The game features various breeds of hamsters, but none are called "H-Hog."

It's possible you're thinking of a different game or a specific breed of hamster that doesn't exist in Petz Hamsterz 2 DS. If you can remember any more details about the hamster or the game you're thinking of, I might be able to help you further.