Personalized We Are a Dog and Mouse Pair Youth Long Sleeve 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 Youth Long Sleeve T-Shirt - Red, great for a pair of besties, twins, siblings, and more. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)