It's like the pet version of the towel on a stick.
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But seriously, that's probably more of a capitalist invention. So many useless gadgets that are supposed to make your life just that little bit easier.
Given the preponderance of the Pennsylvania Butt Explosion Epidemic, that's surprising. But then, my point is that I'm living among a number of younger, semi-fit people -- and they need a device just because they can't stoop over to pick up a tennis ball.