Jumping in play is very different from jumping over something. What I did was start really low, just high enough so my dog had to pick up her feet, but not actually jump. I went over the jump together with her, saying JUMP the moment she went over. Then I throw a ball(Jinx loves the ball as a reward when we are training). After a few times, I stop jumping with her. I made her sit in front of the jump, placed myself on the other side of the jump and then calling her towards me. As soon as she went over, say JUMP, and throw the ball. This way she will keep moving and it will stay fun for her. I have notice in training, most dogs will stop as soon as the handler stops moving. So by calling her towards you over the jump, you can create the movement you want. My next step was to sit her in front of the jump then running towards the jump. She jumps, you go keep running. And then slowly raise the bar. Right now we are still training with the bar at 40 cm, which is about 16 inches. When we are going into competion and we clear our beginners levels the bar will be raised to 65 cm( 25,6 inches) Really high for my girl who stands 54cm(21.3 inches) high!!