Personalized I'm Five Years Old with Dog and Mouse Women's V-Neck T-Shirt. Celebrate your birthday with Dog and Mouse, the unlikely best friends from the children's book "Dog and Mouse" by Michelle Nelson-Schmidt. I'm Five Years Old with Dog and Mouse Women's V-Neck T-Shirt - Pink, perfect for young readers, helpers, and great friends on their birthday. 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