Aww... That's pretty sad, and it surprisingly depresses me more than hearing the death of a human actor.
Moose was fantastic as Eddie. I totally adored the scenes that he was in.
Moose will be greatly missed.
And on the subject of Eddie and Jack Russells, there's a game which is so adorable and fun to play.
Everytime I play the game, I think of Eddie.
Try it out!
http://www.newgrounds.com/portal/view/289115
EDIT: Such a cute dog you have, Katie! ^_^