Personalized Dog and Mouse Youth Long Sleeve 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 Youth Long Sleeve T-Shirt - Red. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)