Our New York Jets dog sweater keeps your four legged friend warm and cozy. It is a great conversation starter, and your friend can stay warm just like you do. The large is for 20 to 24 inches back length measuring from base of neck to base of tail. When measuring for proper fit, consider your pet's build, thickness of hair or fur, and growth potential. This item is submitted for production when ordered; please allow up to 14 days for it to ship out.