The coxofemoral joint in this dog has developmental abnormalities leading to repeated trauma, inflammation, and pain. The dog, a 9 month old Rottweiler, is being fed an appropriate large breed dog food but is allowed to eat free choice. The extra nutrients consumed allow for an accelerated growth rate. The muscles cannot develop and mature fast enough for the rapidly growing bones and thus cannot hold the femur into the acetabulum. Without the head of the femur juxtaposed to it, the acetabulum cannot mold itself correctly to the femoral head. This results in a poorly conformed coxofemoral joint. This is supported by the positive Ortalani sign reflecting increased laxity because of poor articulation of the joint. This poor articulation can cause trauma to the dorsal acetabulum or the articular cartilages. The trauma induces an inflammatory response causing the release of cytokines resulting in pain. The pain is worse after initial movement of the joint and after periods of prolonged usage.