Many years ago My wife and I were breeding, showing and hearding cattle with Bouviers. We kept about 6 at a time so walking wasn't a great option. We used a product called Springer which was the same idea. I wouldn't use it on busy streets or MUP's but in the right environment, (dog friendly trail) they work well. The main problem is you don't have a feel for the dogs performance. It is easy to run them to exhaustion or run their pads raw and they aren't in a position to tell you.

For one or two dogs, I would avoid it. Take your dogs for a walk. It's what they love best.