Using a trolley system provides your dog outside freedom while keeping them secure. Extending a cable from one location to another is how trollies operate. It attaches to your dog's harness using a pulley. Unlike a stake tie-out, which restricts your dog to a specific location, this cable travels along the trolley line, unlike a tie-out where your dog can roam in a circle from around the stake's central point when you tether them out. A trolley enables your dog to go a predetermined distance rather than the entire line.
Whenever your dog has a vast space to roam, a trolley might not be appropriate because they are typically too difficult to set up while moving. It works well as permanent yard installations or in locations where your dog's freedom of movement has restrictions to a rectangular space.