How wide should a horse bridge be for obstacle training?

A bridge used for introducing horses to bridge crossing should be wide enough that the horse feels it has adequate room to stand squarely on the surface without its feet being close to or over the edges, and wide enough that the handler can position themselves safely alongside the horse during the ground introduction without standing on the bridge themselves and potentially amplifying the horse's concern about the surface. A bridge that is too narrow for the horse to stand comfortably with all four feet creates the perception of confinement and instability at the exact moment the horse needs to feel safe and secure, which works against the training goal. For most average-sized horses, a beginner bridge that is four to six feet wide provides adequate room for the horse to stand confidently while still being narrow enough to qualify as an obstacle requiring the horse to commit to a specific path. The width consideration also affects how the horse can be guided: on a wide bridge the handler has room to correct a drift or realign the horse's path without the correction requiring the horse to step off the side, while on a narrow bridge any significant drift results in the horse going off the edge. Narrow bridges — two feet wide or less — are advanced competition obstacles that should only be approached by horses that have established complete confidence on wider surfaces first. The progression from wide to narrow follows the same principle as the progression from stable to moving: the horse's confidence at the current width should be genuine and consistent before the additional challenge of a narrower surface is introduced. A horse trained progressively on appropriate widths will handle narrow bridges when it is ready for them; a horse pushed onto a narrow bridge prematurely almost always has a frightening experience that makes subsequent bridge training harder rather than easier.