Pet Supplies and Products for Animals Design Double Dog Run Tangle Free Tie Out by Kimberly Wherley The Double Dog Run System is a tie out system for two dogs. The system allows two dogs to play freely without getting tangled. In addition to tangle-free, the dog run is also strong holding up to eight-hundred pounds at a time. The dogs are also able to run in 360 degrees at any speed. The dog run is portable, offers safety and an excellent experience for dogs and their owners.