Personalized Mouse: Be A Friend Youth Long Sleeve T-Shirt. Mouse: Be A Friend Youth Long Sleeve T-Shirt - Heather, from "Dog and Mouse" by Michelle Nelson-Schmidt shows us that being a friend is the best thing you can be. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)