We have raised 10 service dogs with this great tool. Countless other dogs and riders have used the Bike Tow Leash® confirming ease of use, comfort and exercise. They have covered many thousands of miles without the BTL causing so much as a scratch to dogs or riders! Everyone wants to be the one propelled by the dog to school, on the beach, on trails, to the park and the store! I am grateful to my family and expanding circle of friends whose patience, help and advice have made the 1-Running-Dog Bike Tow Leash available for you and your dogs to enjoy as well. Michael A. Leon LEON Engineering, Inc.