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How to walk two dogs on leashes
Use the proper kinds of leashes.
If you're going to walk two dogs, choose solid leashes with a set length, about 1.5 meters or more. Any style is appropriate, but thick braided nylon leashes tend to be the strongest and longest lasting.
Pick one appropriate to your dog's size and energy level. Variable-length button-activated leashes tend to get tangled a lot more easily and encourage the dogs to pull at the leash.