Dog Puppy Shirt Tank Vest For SMALL and LARGE Big Dog SPORT Football Soccer DELIVERY TIME 2 - 4 DAYS! PLEASE measure you pet. LENGTH is from neck to the base of the tail. CHEST is measured directly behind the front legs. Please measure your pet and compare to the chart provided as each brand and style of pet clothing has its own sizing system. One brand size M can very well be another brand size XL! Each listing has its own unique chart and no two listing charts are the same.