Animals have been around in cartoons, both in comic-strip and animated forms, for about as long as the media have existed at all and few creatures have been used as prominently as dogs. I'm sure everyone grew up watching numerous shows featuring them but here are my five faves:
Here Comes Garfield, in which the perpetually-happy Odie is captured and taken to the local pound. Garfield is distraught and risks everything to save his good friend but of course, as soon as he's back home he's getting kicked off the table once again! He never seems to mind too much though, he's the happiest dog ever, after all!
3. Scooby Doo