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.