Personalized Mastiff Dog Dad Women's V-Neck T-Shirt. Worlds best Mastiff Dad Women's V-Neck T-Shirt - Aqua for the owner of an English Mastiff dog. 5.0 oz., 100% pre-shrunk cotton Athletic Heather is 90/10 cotton/polyester 1x1 rib collar with mitered v-neck Shoulder-to-shoulder taping Ladies' fit