This adorable "Big Dog" T-Shirt is made out of a Cotton/Lycra Blend. It is embossed with silver metal lettering and is machine washable. Sizes: Big Dog X Small: 30-45 Lbs. or 20-24 inches. Big Dog Small: 45-60 Lbs. or 24-28 inches. Big Dog Medium: 60-80 Lbs. or 28-34 inches.