Enjoyed watching the video! Great to see you including the dog in your lives like that. Awesome!
We have two Jack Russells, where even with leashes I couldn't trust them not to bolt after a cat, dog or squirrel. Their prey drive is too strong. This is how we cart them around ... and they're tethered in so they can't jump out.
https://www.youtube.com/watch?v=cxsXzBp3dlg