A torn knee ligament is a condition that all dogs can experience. The causes of a torn knee ligament are divided into 2 types: acute and chronic. 1. Acute: Usually caused by an accident, such as a dog falling into a hole, causing the hind leg to twist inward, causing the knee ligament to be pulled excessively and eventually torn. 2. Chronic: Dogs often have osteoarthritis from a dislocated patella for a long time, which predisposes them to a torn knee ligament. Most dogs, around 80%, tend to have chronic ligament damage. The image shows the position of the knee ligament. Normally, it holds the tibia in place and prevents it from moving forward. However, if a ligament tear occurs, the tibia can move freely forward. This makes the knee joint unstable when the dog walks. Source…