Size S : Chest girth: 16"-20'', Neck girth: 12"-14'', Back Length:10", Suggest weight: 10-22 lb;

Size M : Chest girth: 20"-24'', Neck girth: 14''-16", Back Length:11", Suggest weight: 22-44 lb;

Size L : Chest girth: 24"-28'', Neck girth: 16''-20", Back Length:12", Suggest weight: 44-66 lb;

Size XL : Chest girth: 28"-32'', Neck girth: 20''-24", Back Length:14", Suggest weight: 66-80 lb.

Note: Please measure the measurements carefully and choose the most suitable product for your pet