Hi, this is Debby and Belle. Belle is a lab/shepherd mix who is 3 yrs. old. She is a reactive dog but loves to learn and do tricks. I am trying to teach her to push a soccer ball and also am teaching her to ride a skateboard. She can already put one foot on the board and ride for a30 seconds but I can't get her to go longer even though I withhold the treat for more riding. I have the same problem with her pushing the ball. How do I get her to ride longer on the board and push the ball longer? Thank you. Debby and Belle