Originally Posted by Glacier
I don't use the safety release. I use a cable neckline off my dogsled. Same length as the line that came with the springer. I use two brass clips, one on the springer, one on the dog's harness. The dogs I run on the Springer are either incapable of coming when called or aggressive to other dogs. I can't have them getting loose. That said, I've never been in a situation where the safety release would have been any help anyway. I've only fallen once since I got the Springer five years ago and that was going down a big, sandy hill with a malamute, who decided she should chase a squirrel off to the side of us.
You should also check your local by-laws before biking with your dog in any fashion. It may have changed now, but when I lived in Calgary it was illegal to bike with a dog attached to the bike by any means!