Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4837425.

I take care of my daughter's dog once a week for a couple days while she works. I needed a way to prevent this crazy 45lb puppy (a boxer) from eating every wood chip, rock, and piece of cat excrement in the yard, while also allowing her to wander in a limited radius, without the leash dragging on the ground and catching on things. A retractable leash mounted high sounded like the best idea, but I could only commonly find them in 10ft and 16ft maximum extension lengths. So, I made this device that provides a way to shorten the strap to whatever maximum length I want.

If Thingiverse keeps the photos I uploaded in the proper order, then they show the sequence followed for proper wrapping and securing of the strap on the Leash Keeper.