Such clinical signs can vary with patient age, with mean ages at diagnosis averaging between 2 and 5 years for dogs6 - 8 and 37 and 40
months for cats.2, 3 Signs can worsen if body weight is increased,
articular cartilage damage is present, and if there is concurrent cranial cruciate ligament (CCL) rupture.9 Affected cats have shown signs of intermittent locking of the stifle after extension and can have a shuffling or crouching gait.