I just tried a "Walkydog" attachment for my bike to road my dog. It worked as promised, but I have some concerns. First of all I have a street bike, and I'm riding on concrete. My dog was a little tentative for the first 1/4 mile, but then got into "search" mode after he saw a few squirrels/rabbits. They would run, of course, & the dog tried to follow. I was able to control the dog, but he pulled as much as he could. When I got home & looked at his pads, they were smooth & one was about burned through. I've tried liquids "tougheners" in the past during hunting trips & they didn't do anything. Has anyone else roaded their dogs like this, & how did their dog's pads hold up? What about joint problems from running on concrete. It's got to be allot harder on a dog than through a field.