How do you know if a rope horse is getting sour?

Sourness in a rope horse develops gradually and the early signs are subtle enough that many ropers miss them until the horse's attitude and performance have deteriorated significantly. The earliest indicators are changes in the horse's willingness around the barn and at the start of sessions: a horse that used to walk to the gate and now hangs back, that used to stand quietly for saddling and now pins its ears or moves away, or that used to warm up forward and relaxed and now warms up flat and distracted is showing the beginning of sourness rather than a random bad day. Under saddle, sourness shows up as a horse that lacks its previous forward energy, that shows resistance at specific points in the run that it previously handled willingly, or that has become progressively heavier in the bridle and less responsive to leg aids over time. In the box, a sour horse often develops anxiety or reluctance it did not previously show — pawing, leaning on the gate, hesitating to enter. The common thread in all early sourness indicators is that something the horse previously did willingly has become something it resists or avoids, and the resistance is consistent across sessions rather than occasional. A horse having a bad day is different from a horse showing early sourness: the sour horse's indicators persist and accumulate rather than clearing on the next session. Catching sourness at the early indicator stage — when management changes can address it — is far more effective than waiting until the horse is fully resistant and the sourness is deeply ingrained.