I have one. Worked nicely for while, but not anymore. With my qh she figured out RIGHT away she can pull the rope through and make it long enough to enjoy the grass around (and looping it twice as it's suggested in video didn't help - she's strong enough to still pull it thru). So I ended up just tieing her to that ring. With my spooky (and more stupid) paint it worked for while till she understood how to pull it, so she just kept backing up till the whole rope went through. However I still think it's worth to try.