Before purchase, please conform the size is suitable for your loved dog. The best way to measure chest size of your dog is to measure the widest part of his or her chest rib cage S:Chest 12'-16', Neck 6'-10',Back length 7', Suitable for small dogs.,M:Chest 16'-19', Neck 12'-15',Back length 9', Suitable for small dogs, L:Chest 20'-23', Neck 12'-17',Back length 12',Suitable for Medium-sized dog.XL: Chest 21'-27', Neck 15'-19',Back length 13,Suitable for Medium-large sized dog.2XL:Chest 28'-37', Neck 19'-23',Back length 17',Suitable for Medium-large sized dog. Unique Portable Handle: NO accdient!?Convenient to grab it when putting into or aiding leaving water, make your dog one controlled totally.?Easy rescue, save strength. Adjustable nylon straps, quick-release buckles, velcro on the back and belly, comfortable and securely fastened. Sturdy Buckle: match with leash rope, also be resistant to high-strength pull.