It won't be hard to make one. I think a saddle for hens can be modified for a harness. A zip lock bag of treats and a cool pleasant day he might be the talk of the town. Once upon a time a family took their pet Emu on a harness to town for a parade and he stole the show.I never thought of a harness I can’t figure how it would work, but it would be funny walking around with a rooster on a leash. He seems to enjoy hanging out with the cats and our elderly blind dog. But he does like to follow me around. We have almost 5 acres but he does wander off the property.