This Dog Likes Leaping Half-Way Down the Staircase

This is from September, but the video is everywhere now.  It's a dog leaping down the staircase of a house.  It starts with a woman asking if he wants to go down the stairs, so he heads down about half-way, and then changes his mind.

He goes back up, disappears into a room, and then comes running full speed and leaps over half the stairs . . . and bounces the last few steps on his belly.  He seems okay, but a vet says doing something like that can cause serious injury.