How do you know when a horse is genuinely collected versus pulled together?

Distinguishing genuine collection from a horse that has been pulled together — compressed through rein pressure into an approximation of the collected frame without the underlying hindquarter engagement that genuine collection requires — is one of the most important diagnostic skills in dressage and one that is most clearly revealed by specific tests rather than by visual assessment of the horse's head and neck position alone. The most reliable test is the give-and-retake of the rein: a genuinely collected horse will maintain its balance, frame, and activity when the reins are softened or momentarily given because its self-carriage is coming from its hindquarters rather than from the rider's hand. A pulled-together horse will drop onto its forehand immediately when the rein support is removed because the rein was providing the balance that the hindquarters were not. The quality of the contact is another indicator: genuine collection produces lightness and elasticity in the contact as the horse's weight shifts genuinely backward; compression typically produces increased heaviness or a horse that is behind the vertical and avoiding genuine contact, neither of which is the softening that genuine collection produces. The activity of the hindquarters tells the story most clearly from the ground: a genuinely collected horse has active, engaged hind legs that step well under the body with visible flexion in the joints — the hind legs carrying rather than trailing; a compressed horse often has relatively inactive hind legs that have simply slowed rather than engaged, with the shortened frame coming from restricted forward movement rather than from increased hindquarter engagement. The quality of the movement confirms the diagnosis: genuine collection improves the expression and elasticity of the gaits; compression reduces them, producing shorter, flatter, less expressive movement that judges and experienced observers immediately recognize as a training problem.