Those were Bimmer's favorite toys when he was a pup! He could entertain himself endlessly with one. I'd take him to the high school track to walk every evening. It's fenced in, and there's a big field in the middle for football practices and soccer, and there were always water bottles laying around! If there weren't many people there I could let him loose and he'd find a bottle, bring it to me to check out, then take it out in the soccer field and throw it in the air, chase it, kill it, kick it all over the place . . .