My Greater Swiss loves to bikjour with us!! I’m a complete ammy at it and just use a regular dog harness, and only take her on some easy biking trails or just around campgrounds.
She is not built for speed at 118lb, but can have quick bursts of speed and I have taken her on 5-10km rides. She starts off at a gallop but after a little bit settles into a nice jog. She does pull me for the first while and I let her come back to me at the trot and not pull when she tires a bit, so perhaps not quite the true bikejouring. Its a great way to tire her out as she does have endless energy (or so it seems to me!). She is a pulling breed so it is in her genetics, though only small bursts, not meant to go for miles.
She is quite reactive on leash if I walk her (as in she wants to meet and greet every dog she sees or try to chase squirrels or anything that moves) but is very focused when she is bikejouring. She doesn’t pull towards other dogs then and keeps on trucking. I never actually trained her for that, it seems to come naturally to her when she has a job. She did pull me sideways once off my bike when I hit a popular trail downtown Toronto as the squirrels literally sit at the edge of the bike trail and are not scared of anything! It was too tempting to her lol!
She was super easy to train and absolutely goes crazy when she knows she is bikjouring with us. It really is her most favourite thing to do! Maybe I should look into a proper harness and lead…