PRE-OA
Clinically normal with or without known risk factors. Includes dogs with developmental orthopedic disease or injury that could cause arthritis later in life.
EARLY
Earliest signs can include changes in behavior, body position and movement.
MILD
Signs may include less interest in going on walks or playing. Signs may be consistent or intermittent.
MODERATE
Signs may include limping, struggling to get up or lie down, or refusing to climb stairs.
SEVERE
Dog may have difficulty standing up and walking. Signs are consistent and present at all times.