ventricular septal defect: a common congenital heart defect; an abnormal opening in the septum dividing the ventricles allows blood to pass directly from the left to the right ventricle; large openings may cause congestive heart failure
defect: an imperfection in a bodily system
boxer: a breed of stocky medium-sized short-haired dog with a brindled coat and square-jawed muzzle developed in Germany