I tried using both the springer and the bicycle dog leash (same principle - different mechanism) with one of my rescue dogs - but he was still too strong and once took the bike with him after a squirrel and left me behind in a heap. I then rollerbladed him around the park letting him set the pace - it is about 4 miles - he loved it. He is now 13 and doesn't go very far anymore but he loved both (rollerblading with a halti was just safer for me). We have several people who bike with their dogs around the park and they all seem to love it. 4- 5 miles was about his limit in the summer - in the winter we sometimes went around twice.