Personalized Dog Long Sleeve T-Shirt. What a good pup! Dog Long Sleeve T-Shirt - Red from Michelle Nelson-Schmidt's children's book "Dog and Mouse" is looking for a friend that's loyal and true. Could it be you? 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