So I dusted of our old old bike, used some wd-40 where necessary, replaced the back tube and tire and was ready to go. The walkydog has a spring loaded system built into the shaft which provides forgiveness for unexpected motions from the bike or from Kassa. I did some short trips at first up and down the street. Kassa loved it. We didn't go too fast but definitely faster than jogging speed. Now I take him on routes that would have taken an hour walking and we get through in 20 min. On the way out he is usually trying to pull the bike a bit, but when we turn around he often tries to hang back. I slow right down to keep him right beside me. I will say its a good idea to know your route well ahead of time. When we encounter dogs in the yard (especially if they can ignore the invisible fence) I slow to a walk/stop. Although Kassa has more power over the bike when we aren't moving, I can always put my feet down and it is better then him getting chased and riled up by the other dogs.
If you want to try this I would recommend you build distance slowly. Try to go at a cooler time of day. Plan a water break. Lastly pay attention to his feet. You don't want to run him over sewer drains and you don't want to ware his pads down on the asphalt.
I think this is a great option for when you can't meet friends at the dog park. In this case I could. Kassa and I had a lot of fun. I hope Tequila did too.