Unlike sudden ACL tears in human athletes, canine CCL injuries often result from gradual degeneration worsened by excess weight and genetics. Signs include hind-leg lameness, reluctance to jump, and sitting with the affected leg extended to the side. Small dogs may improve with strict rest and anti-inflammatory medication, but most medium and large dogs benefit from surgical stabilization such as TPLO or lateral suture techniques. Rehabilitation therapy speeds recovery, and managing weight reduces stress on both knees since the opposite leg often compensates and may tear later.