Personalized Mouse: Be A Friend T-Shirt. Mouse: Be A Friend T-Shirt - Pink, from "Dog and Mouse" by Michelle Nelson-Schmidt shows us that being a friend is the best thing you can be. Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.