What Cold Backed Really Means
Cold backed is a rider term, not a strict medical diagnosis. It usually describes a horse that reacts to the saddle, girth, or first few minutes of work with tension or resistance, then improves once they warm up. The root causes can be anything from muscle stiffness and saddle fit to remembered pain or nervous anticipation.
The important part is this. Your horse is not trying to make your life harder. They are telling you that the transition from standing to working does not feel safe or comfortable yet.