Maths/ statistics: standard deviation?

adult female dalmatians weigh an average of 50 pounds with a standard deviation of 3.3 pounds.Adult female boxers weigh an average of 57.5 pounds with a standard deviation of 1.7 pounds. one lecturer in the department owns an underweight dalmatian and an underweight boxer. the dalmatian weighs 45 pounds, and the boxer weighs 54 pounds. which dog is more underweight? also explain fully pls