Torchlight and soon to be released Torchlight 2 both have a pet ferret
that can accompany your character (as well as a dog, cat and loads of
other animals you can download and add). Here's a vid I made of
gameplay for the first game and the vid description has a link on how
to get the game. If you preorder Torchlight 2 you also get to play
Torchlight now:
http://www.youtube.com/watch?v=nKkyOaehLaA

Diablo III, which just came out, has ferrets you can summon if you
play as the Demon Hunter once you have reached Level 46. They'll
attack monsters for you and collect your gold. Whether they give all
that gold to you afterwards remains to be seen

Both of these games are "dungeon crawlers" where you have quests to
complete and lots of crazy monsters to defeat. Lots of fun and the
graphics are absolutely incredible in Diablo III.

[Posted in FML 7458]