I've seen dogs (not rotties mind you) riding on the back or on the tanks of motorcycles before when we were in Sturgis SD for bike week! It's adorable, maby not safe, but adorable none the less! Thanks for sharing that!
We've thought about getting one of those pull alongs that you put bigger children in for Angus when we go biking, that way he could go too, and not get tired! But I doubt he would go for it, he would probably get scared and jump out! But come to think of it, once when my mom was visiting, we put him and Keisha in a little trailer we had hooked to the back of the lawnmower and she jumped out right away, and he stayed for quite a while. I'll have to find my pic and show you, it's sooo cute.