Very good point, Shirley. I honestly don't remember how many Basenji litters I have actually had born and growing up beside the Aga in my kitchen but watching the interaction between siblings and Mom (and Granny, because in Basenjis, grandmother often lactates to help Mom at feed times) is very instructive. Some Moms have been seen to nose the more bouncy pups out of the bed box as a way of disengaging.
I have also watched a friend's Doberman litters and while the two breeds are poles apart once out of the nest, the puppy / Mom relationship gives clues to early training. Her Dobes are renowned for their good manners and were I ever to consider changing breeds (unlikely) I would only ever buy a pup who has had as good a start in life as hers receive.
Walking away, turning away, basically just quietly disengaging, brings home to Basenjis that enough is enough. They soon learn !