Personalized Dog and Mouse Toddler T-Shirt. This unlikely pair found their very best friends in each other. From the children's book "Dog and Mouse" by Michelle Nelson-Schmidt comes Dog and Mouse Toddler T-Shirt - Vintage Hot Pink. 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.