I've never seen the Doberman Gang. I've heard of it, though. I remember there was this one movie I watched just once with a Great Dane and a pack of mischevious Dachshunds. I have no idea what it's called though and so I've never seen it again. I really liked it as a kid though, probably just because we had Dachshunds.
I also liked Lassie (can't remember what year the one I like was made though), Homeward Bound, Fluke, Beethoven one and two, 101 Dalmatians (all of them), Eight Below, Snow Dogs... and probably a lot more! I've probably seen almost all the dog related movies that have some out in the last 25 or so years.