Sizing A Dog Polo • Sizing for Dogs from 6 to 16 • Size: 6 – 13” Chest , 6” Length Up to 3 lbs • Size: 8 – 15” Chest , 8” Length Up to 6 - 8 lbs • Size: 10 – 17” Chest , 10” Length Up to 9 - 14 lbs • Size: 12 – 19” Chest , 12” Length Up to 14 - 25 lbs • Size: 14 – 21” Chest , 14” Length Up to 20 - 35 lbs • Size: 16 – 23” Chest , 16” Length Up to 25 - 40 lbs