I expanded on the idea of a coupler leash and created a bigger system of leashes that allows the number of dogs connected to me to fluctuate between one and eight. Each leash has bungee inside of it that provides the dogs with a slight increase in resistance to warn them that they are reaching the end of their leash.
The leashes are each equipped with a steel ring on the end so they can be easily attached to the rings of other leashes with the use of a large carabeener (locking metal clip). Once all the dogs are connected to each other, I then connect them to myself using a rock climbing harness and a "leash" for myself. The rock climbing harness offers me more control over a group of dogs because it lowers my center of gravity and offers me more strength than simply using my arms.
The system allows me to be completely hands-free, and therefore able to carry the rest of our playdate equipment to the park, manage their behavior while we walk, clean up after their quick pit-stops, and occasionally untangle their feet from the leashes.
You can run a search on both Facebook and Instagram for the hashtag, #MandasDogWalkingHacks to see some videos I have posted of this system in use!