Longhorns NCAA Dog Jersey Officially Licensed Longhorns NCAA Dog Jersey - Small XS Jersey Sizing - Length (6-9"), Girth (8-12"), Neck (6-8") Small Jersey Sizing - Length (8-12"), Girth (13-18"), Neck (10-14") Medium Jersey Sizing - Length (14-18"), Girth (19-24"), Neck (14-18") Large Jersey Sizing - Length (20-24"), Girth (25-28"), Neck (18-20")