PC video game about a dog, XMas levels

[Strudel]

Hello, I'm looking for an old video game where the playable character was a dog. You were collecting sweets and candy, maybe gems as well(?) around the map. I also remember that there were a lot of hidden rooms you could uncover. The game also had a some sort of "Christmas edition" or Christmas levels. I think it had "Xmas" in that dlc title, I really hope this helps. Thanks for any suggestions.

[Rwolf]

An actual dog or an anthropomorphic (human-like) version?

When was 'old'?

[486 player]

Happyland Adventures