Personalized We Are a Dog and Mouse Pair Toddler T-Shirt. This duo find friendship in the most unlikely of ways in "Dog and Mouse" by Michelle Nelson-Schmidt. We Are a Dog and Mouse Pair Toddler T-Shirt - White, great for a pair of besties, twins, siblings, and more. A toddler-soft cotton tee in look-at-me, big kid colors. 4.5 oz., 100% combed ringspun cotton. White is sewn with 100% cotton thread. Topstitched rib crew neck. Double-needle stitched sleeves and bottom hem. Shoulder-to-shoulder taping.