Personalized That's right! You're my best friend! Youth T-Shirt. Show off your bestie with That's right! You're my best friend! Youth T-Shirt - Red, featuring Dog and Mouse from the children's book "Dog and Mouse" by Michelle Nelson-Schmidt. 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.