My mom tried one of those with her golden doodle (around 70 pounds, hyper like a poodle and dumb like a golden retriever).
5 minutes in he ran for something, knocked her down (she was in her mid 60s at the time), and dragged her bike away. It had some sort of breakaway plastic coupler too, but it was too pliable and just stretched a bit instead of breaking. Looked like HDPE maybe.
Now the contraption is in my garage, in scrap metal pile. If she wants to ride somewhere with the dog she tires him in a trailer.
My mom tried one of those with her golden doodle (around 70 pounds, hyper like a poodle and dumb like a golden retriever).
5 minutes in he ran for something, knocked her down (she was in her mid 60s at the time), and dragged her bike away. It had some sort of breakaway plastic coupler too, but it was too pliable and just stretched a bit instead of breaking. Looked like HDPE maybe.
Now the contraption is in my garage, in scrap metal pile. If she wants to ride somewhere with the dog she tires him in a trailer.
Be careful with them!