Personalized Loyal and True Dog and Mouse Youth Long Sleeve T-Shirt. Dog wanted a friend who was loyal and true, then along came Mouse, and Dog just knew. Loyal and True Dog and Mouse Youth Long Sleeve T-Shirt - White, because sometimes the things we want most have been in front of us the whole time. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)