The most common clinical signs with MPL in small or toy breed dogs includes limping and skipping with the affected leg or legs. A popping/clicking sound or feel may be heard or felt by the owner when the pet flexes and extends the rear legs.
Clinical signs usually begin around one year of age. Infrequently, some dogs live for years with a MPL without clear clinical signs only to develop lameness in later life. In this scenario many times a cranial cruciate ligament rupture or tear is responsible for the late onset of lameness. In some patients with late onset of signs, the cartilage wears through to the underlying bone causing acute pain and lameness.