"A horse harness is a device that connects a horse to a horse-drawn vehicle or another type of load to pull. There are two main designs ...
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of horse harness: (1) the breast collar or breaststrap, and (2) the full collar or collar-and-hames.
For pulling heavy loads, a full collar is required because it distributes pressure over a larger area of the horse. An ill-fitting full collar can cause chafing on the horse's skin and can interfere with its breathing, as can a breast collar that is positioned too high.: 38, 42–3, 82, 118, 129
Putting harness on a horse is called harnessing or harnessing up. Attaching the harness to the vehicle or load is called putting to in the British Isles,: 219 or hitching in North America. The order of putting on harness components varies by discipline, but when a horse collar is used, it is usually put on first." - (en.wikipedia.org 14.11.2023)
