The halter is the most frequently used piece of equipment on any horse, and for the Hackney it needs to balance durability with a degree of refinement that suits the breed's fine head and alert carriage. A well-fitted leather halter with adjustable crown, noseband, and throatlatch buckles provides a secure fit without the bulk that can make a nylon halter look clunky on a refined head. Leather also breaks under extreme pressure — a safety feature that prevents neck injuries if the horse pulls back while tied.
Bridle selection depends on the discipline. Hackneys shown in harness classes typically wear a full bridle with a liverpool bit or butterfly bit, blinders, and an overcheck or sidecheck — all components governed by the specific class rules of the show organization. The bridle must be fitted precisely to avoid pinching at the poll, gapping at the browband, or interference with the bit's intended action. A bridle that fits poorly creates discomfort that a spirited horse will express through head tossing, gaping, or resistance.
Driving harness is the Hackney's signature tack and represents a significant investment. A complete show harness includes the collar or breast collar, hames, traces, saddle pad, crupper, breeching, and reins, all of which must fit as an integrated system. Poorly fitted harness creates pressure points that cause rubs, sores, and behavioral resistance. Every contact point — collar across the shoulders, crupper under the tail, girth behind the elbows — should be checked for even pressure distribution and adequate clearance from bony prominences.
For pleasure driving and everyday training, a less formal but well-constructed harness set reduces cost without sacrificing function. Synthetic materials like biothane offer durability, easy cleaning, and weather resistance at a fraction of the cost of fine leather show harness. The fit considerations remain identical regardless of material — no amount of cost savings justifies a harness that pinches, rubs, or restricts the horse's natural movement.