The main thing I'm worried about right now is hurting Elsie somehow. When we bike now, if she doesn't think we're going fast enough, she'll pull me some. She only weighs 38lbs, though, and I can't find anything assuring me that's okay.
I've found plans online for how to make your own harness and scooter line, so I might try that.
I also haven't found much on how to train it. The idea doesn't seem all that complicated from the outside, though... but that's the way it always is, right?