Canine Knee Model Canine knee model of average size with femur, fibula, patella and tibia bones; lateral and medial meniscus; anterior and posterior cruciate ligaments; plus six more ligaments and tendons. Canine Heart & Lung Model Canine heart model and lungs infested with heartworms (dirofilaria immitis). Cut-away view demonstrates structures in the heart (right ventricle, pulmonary trunk, pulmonary arteries, and lungs) where adult-stage heartworms are normally found. Canine Jaw Model Canine jaw model of average size depicts healthy teeth on the right side and diseased and damaged teeth on the left. Featured pathologies: fractured canine, periodontal disease, tartar accumulation, plaque, gingivitis, worn incisors, retained deciduous tooth, missing premolar and (canine) gingival recession. Jaws open, close and separate for closer study.