Personalized I'm Nine Years Old with Dog and Mouse with White Text Women's 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 Nine Years Old with Dog and Mouse Women's T-Shirt - White, perfect for young readers, helpers, and great friends on their birthday. Classic ladies' styling with a feminine neckline, sleeves and fit. 5.0 oz., pre-shrunk 100% cotton. Double-needle stitching throughout