Dresses Sizes Back Length Chest Neck Weight (pounds) X-Small 8” 10”-13” 7”-10” 3-5 Small 10” 13”-16” 10”-12” 6-"10" Medium 12” 16”-19” 12”-14” 11"-15" Large 15” 19”-22” 14”-17” 16"-25" Nylon Collars Sizes Neck Width Cat 6"-10" 3/8" X-Small 6"-10" 3/8" Small 10"-14" 3/8" Medium 10"-18" 5/8" Large 18"-26" 1" X-Large 21"-32" 1"