Personalized Mouse: Be A Friend Long Sleeve T-Shirt. Mouse: Be A Friend Long Sleeve T-Shirt - Athletic Heather, from "Dog and Mouse" by Michelle Nelson-Schmidt shows us that being a friend is the best thing you can be. 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