This Christmas Costume Design for Small to Large dogs, please measure your pets correctly and check the size chart before shopping. If there is a difference between the neck and the chest, follow the chest size. And we recommend that you can buy a bigger size if your dog is between sizes. Size information: S: Neck Girth:10.2-11.8"/26-30CM, Chest Girth:13-18.5"/33-47CM, Back Length:10.2"/26CM,Recommended Weight 2.2-11lbs. M: Neck Girth:11.8-15"/30-38CM, Chest Girth:18.1-22.4"/46-57CM, Back Length:12.6"/32CM,Recommended Weight 13-27lbs. L: Neck Girth:14.2-17.7"/36-45CM, Chest Girth:20-25.2"/51-64CM, Back Length:16.1"/41CM,Recommended Weight 27-43lbs. XL: Neck Girth:17.3-20.5"/44-52CM, Chest Girth:22.8-29.5"/58-75CM, Back Length:19.3"/49CM,Recommended Weight 43-63lbs. XXL: Neck Girth:20.4-25.6"/52-65CM, Chest Girth:24-32.3"/61-82CM, Back Length:22.8"/58CM,Recommended Weight 59-75lbs. Feature: 1.Christmas is coming to town,wear it now and get Santa running outdoor; 2.Great Christmas Gift