Personalized Dog Youth T-Shirt. What a good pup! Dog Youth 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? Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.