Cranial Cruciate Ligament Rupture Anterior Cruciate Ligament (ACL) is a common injury in humans, and in dogs. In dogs the same ligament is called the Cranial Cruciate Ligament (CCL). CCL Disease is multifactorial and many times a chronic condition. It is most commonly seen in active dogs, can be hereditary, can occur as a result of trauma, and can be related to an individual’s tibial plateau anatomy. Dogs with steep tibial plateaus are more likely to rupture their CCL.