The short answer for a Mustang
Lead a Mustang the way you would lead a horse who is still deciding whether people are safe: at his shoulder, slowly, with every movement announced and every pressure released early. Mustangs range from well-started riding horses to recently gathered animals whose education was being herded into pens, and you lead the horse in front of you, not the average. The breed's survival wiring — fast flight, sharp herd awareness, suspicion of anything closing in behind — means safe leading is mostly trust management. If he is greener than a halter-broke horse who walks on a loose rope, the leading starts long before the first step.
Reading a Mustang before the rope goes on
Watch your Mustang loose first, because his body tells you what today's walk will be. A Mustang who turns his hindquarters to you in the pen, freezes with his head at full height, or tracks you with a hard eye is not ready to be led anywhere new, however well he behaved yesterday. Flight is his first language: pinned-back attention, a trembling stand, weight rocked onto his hindquarters all say his next move is explosive departure. Cornering him to catch him teaches him that pens are traps and that you are part of the ambush. Work instead in a small, safe enclosure where approach-and-retreat has taught him your arrival predicts nothing bad, and do not clip on a rope until he stands haltered with his weight settled and his eye soft.
Pressure, release, and the shape of the walk
Mustangs learn at extraordinary speed from release, because pressure and its removal were the whole grammar of their early handling. Hold the rope in your right hand with honest slack, the spare folded loosely in your left, never coiled around anything attached to you — if he bolts, the rope must leave your hands without taking you. Walk at his shoulder but a half-step further out than you would with a domestic horse, giving his head room to turn and look; a Mustang who cannot see a threat will assume it is behind him, possibly you. Ask for forward with the lightest possible feel on the rope and release it the moment he thinks about stepping, not after the step lands.
Routes, gateways, and other horses
Choose the Mustang's early routes like a prey animal would: open sightlines, no dead ends, no loose dogs, and an end point he already likes, such as his own pen gate or a hay net. Walk him alone rather than following a buddy horse at first, because herd pull in a Mustang can override weeks of training in one shout from a stablemate — and if he must pass other horses, keep his body between you and them. At gates, open them fully and clip them back; a gate swinging onto his hip confirms every suspicion he brought with him. If he freezes, do not pull and do not let a helper flap at his hindquarters; wait, soften the rope, and let curiosity restart his feet, using pressure-free small arcs when waiting cannot.
Setbacks and knowing when to bring in help
Progress with a Mustang is rarely a straight line: a helicopter overhead or a new handler's hat can return yesterday's confident horse to full flight mode, and the answer is to return to the last step he trusted. Never lead him tied to another horse, and never let an unfamiliar person take his rope mid-walk. If he rears, strikes, or bolts through handlers, stop and work with an experienced Mustang trainer on the groundwork before leading him beyond his pen again, and have your vet rule out pain or vision problems if the behaviour arrived suddenly. Trust this individualised is worth writing down, and KinsLe Care Teams lets you name the specific handlers approved for your Mustang's leading duties and note the quiet routes he knows, with each outing checked off by the person who walked him.