A goat who is working up to challenging people shows it in a recognisable build-up: a hard, fixed stare, head held high, the hair along his back raised in a ridge, stiff sideways approaches, pawing, rubbing his head on you or on fences, and a habit of stepping into your path or your space and refusing to yield. Goat-on-goat head-butting is ordinary herd politics. The warning sign is when that testing behaviour starts pointing at humans.
The build-up, in roughly the order it appears
Early challenges are easy to miss because they look like cheekiness: the goat who stands square in the gateway and will not move, who leans his weight against your legs, who lowers his head toward your hands at feeding time rather than toward the bucket, or who starts rearing and wheeling in front of people instead of herd mates. Raised hackles and a rigid, high-headed stance during these moments are the giveaway that it is not play. Intact males in rut are the likeliest challengers, but wethers and does who have been rough-housed, fed treats from pockets, or allowed to win pushing games learn the same lesson — people can be moved.
Why the goat-on-goat version is not the problem
Within the herd, goats settle rank constantly: head-butts, charges, rearing and crashing horns are how they decide who drinks first, and herd mates answer in the same language and move away when beaten. It looks dramatic and is usually harmless sparring. A challenge aimed at a person is different in kind, because the goat is measuring himself against the species that controls the feed, the gates and the handling — and if he wins small contests daily, he graduates to bigger ones, which is how keepers end up knocked down by an animal who started out as a pushy youngster.
Responding so the behaviour does not pay
Consistency is the whole answer, and it has to come from everyone. Never play pushing or head games with young goats, and never let children wrestle with them. Feed over the fence or through a hatch where you can, so your body is not part of the feeding contest. When a goat steps into your space or lowers his head at you, move him calmly and boringly: step into his space until he yields, or take hold of his collar, lead him a short distance and release him. Keep the moment flat rather than turning it into a fight — wrestling, shouting and smacking make it exactly the contest he wants. If he rears at you, step aside rather than backwards, because retreating reads as a win.
When you need experienced help
Bring in an experienced goat keeper, and ask your vet to check the animal, if the behaviour arrives suddenly in an adult — pain and hormonal changes can sit behind aggression — or if an intact male's challenges are escalating, because breeding males can seriously injure people and may need different housing and handling arrangements. Meanwhile, KinsLe's Care Teams gives you one place to flag the behaviour for everyone who feeds or handles the goat, with the agreed response written down, so the goat meets the same boundary from every person instead of learning which humans he can move.