What causes a four-beat canter and how do you fix it?

A four-beat canter — in which the second beat of the canter's three-beat sequence breaks into two separate footfalls, eliminating the simultaneity of the diagonal pair that defines correct canter rhythm — is one of the most significant rhythm problems in dressage and one that signals a specific category of training error requiring immediate attention. The most common cause is incorrect or premature collection work that has compressed the canter stride without maintaining sufficient impulsion — the horse is asked to carry more weight on its hindquarters before it has the physical strength or engagement to do so while maintaining the gait's natural mechanics, and the result is a canter that has slowed without the suspension and carrying power that genuine collection requires. Tension is a second common cause: a tight, braced back disrupts the natural swing of the canter and often produces a four-beat rhythm as the horse's muscles compensate for the restriction of normal movement. The correction for a four-beat canter requires addressing its specific cause rather than applying a generic solution. If the cause is insufficient impulsion — the most common scenario — the correction involves allowing the canter to be more forward and active, temporarily abandoning the collection work that created the problem and rebuilding impulsion until the three-beat rhythm is confirmed, then gradually reintroducing collection demands within the constraints of what the horse's strength allows. If the cause is tension, the correction requires work that specifically addresses suppleness — transitions, lateral work, and allowing the canter to be more forward until the tension resolves — before returning to any collection demands. A four-beat canter should never be accepted or trained through; it is always a signal that the training approach needs adjustment.