Personalized Happy Birthday with Dog and Mouse Men's V-Neck T-Shirt. Dog and Mouse are excited to wish you the happiest of birthdays! Happy Birthday with Dog and Mouse Men's V-Neck T-Shirt - Athletic Heather, perfect for those who love this friendly duo from "Dog and Mouse" by Michelle Nelson-Schmidt. 4.7 oz., 100% pre-shrunk cotton Narrow, set-in 1x1 mitered V-neck collar Shoulder-to-shoulder taping Double-needle stitched sleeves and bottom hem