Personalized Shih-Tzu Dad (Worlds Best) Dog Breed T-Shirt. This fun worlds best shih-tzu dad T-Shirt - Light Blue is a great gift idea for a shih-tzu owner or dog lover. Everyone loves our Custom T-Shirts! Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.