Hello All! I searched through the forum, but I didn't see many mentions of anyone using a varsity ball. Is there anyone on here that uses one? Does your dog like it? What sort of games do you play with it? I know it's advertised as "needing no human interaction" but I like interacting with my dog, lol. I thought it could be fun to teach my pup to "herd" it into different set up spaces or something? I just hoped to hear some first-hand opinions on them before I dropped 40 dollars on one! Thanks!