Personalized Dog and Mouse Best Friends Toddler T-Shirt. Friends are always there for you - rain or shine. Dog and Mouse Best Friends Toddler T-Shirt - Mauve features two scenes of this budding friendship from "Dog and Mouse" by Michelle Nelson-Schmidt. 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.