Personalized Shih-Tzu Dad (Worlds Best) Dog Breed Long Sleeve T-Shirt. This fun worlds best shih-tzu dad Long Sleeve T-Shirt - Vintage Royal Blue is a great gift idea for a shih-tzu owner or dog lover. 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