Personalized Helping? That's my favorite and very best skill!- Mouse Youth Long Sleeve T-Shirt. Great helpers come in all shapes and sizes. Helping? That's my favorite and very best skill!- Mouse Youth Long Sleeve T-Shirt - White, perfect for fans of "Dog and Mouse" by Michelle Nelson-Schmidt. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)