This would be great with one of those basket trikes, so the dog would have somewhere to ride, maybe even a little bed to sleep in. I'm wondering if my brother will let me borrow his dog...:)
There's a disabled guy in my town with a big basket trike in which he totes his big crippled dog. They make quite a pair. The dog looks absolutely vicious and nasty (and so does his owner) but both of them are friendly once you get to know them.
Interestingly, when people ask me what lock I use, I always say, "The Evolution Mini when my Rottie isn't guarding it". :)