Personalized Puppy 3rd Birthday Youth T-Shirt. I'm three cute puppy. Celebrate your toddler's third birthday with this adorable little doggy. Happy 3rd b-day 3-year-old! 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.