Personalized We Are a Dog and Mouse Pair 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 Long Sleeve T-Shirt - White, great for a pair of besties, twins, siblings, and more. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL