26 points
When my aunt had a puppy, she set up a barrier to prevent the dog from going upstairs. It was low enough for humans to step over, but the puppy couldn’t get over it. Amusingly, as the dog grew up, it never seemed to occur to it that it could now step over the barrier without much fuss.
10 points
We used to be able to put up a blanket “wall” across two chairs to stop the dogs from crossing. It took them a few years to realize they could simply walk through/under the blanket.
7 points
