Bit fit and configuration significantly affect horse welfare through oral pain, communication interference and the development of learned helplessness in training.
Oral pain from poorly fitted or inappropriately used bits causes significant welfare harm that is frequently unrecognised. Horses cannot directly communicate discomfort but show it through behavioural signs including head-shaking, bit evasion, tension and reluctance. The tendency to interpret these signs as naughtiness or training problems rather than pain leads to escalation - stronger bits, additional equipment - that compounds the welfare problem. A welfare-centred approach requires dental assessment, bit fitting by a qualified practitioner, and use of the pain ethogram to monitor training-related discomfort.