YES PLEASE WATCH YOUR DOGS WHEN THEY JUMP.
Our oldest yorkie jumped off a couch and cried like nothing I had ever heard. We rushed him to the vet to find out he had a torn ACL

A week later he had to have surgery.
Our little boy hasn't been the same since

He now has terrible arthritis that has developed in that leg. Some days he can't even walk on it. Other days he is hunched over in pain and shaking uncontrollably. he now regularly takes three different medications for pain and inflammation and has to go in for shots. And it's all as a result of the injury to his back leg. He used to love running up and down the stairs...and now just stands there staring at you until you get him. The worst part through the whole was seeing him try to make his bed (you know where they dig and kick and bunch up the covers?) and he couldnt because of his bad leg
So please...don't let that happen to you. It's heartbreaking when something goes terribly wrong