I did a search for canine treadmills and they start around $1500 for the basic 'run of the mill' mill.
I figured they would be closer to the price of the human version. What was I thinking???
During our 'hibernation' I will check on finding a bike and one or two of the springer thingies to attach the dogs to the bike. I have seen a couple different models. This summer I tried to get around my limitations by roller skating with the dogs and a friend. After using my bumm as a brake I am a bit leary to combine wheels and dogs again.
I know we would both need to take it slow and easy till we know what we are doing, but my keester keeps having flashbacks.