Vivaglory New Sports Style Ripstop Dog Life Jacket Safety Vest, Size Medium (Ribcage Girth Range: 17-33 inches) with Handle and leash attachment ring, adjustable straps and quick release buckles. Dogs are great swimmers natually, but even the best paddlers can't swim for long time, so they need to be equipped with dog life jackets just as adults and children. VIVAGLORY dog life jackets will let your beloved dog go further and play longer, whether your dog is a seasoned water dog or is preparing for his/her first swim. Please give your pet time to get used to wearing the PFD before using it in water. Also please make sure it is adjusted properly. Your pet should have full range of motion in order to be comfrotable wearing this PFD. Why do you choose Vivaglory dog swim vest? 50% more flotation material to keep your puppy safe Reflective trims and bright colors enhance your dog visiblility in the dark Durable grab handle makes it easy to pull your dog out of any emergency Fastening system ensure perfect fit and keep the vest securely on your dog How to select a right size for your puppy? Step 1: find a tape measure or string ruler Step 2: measure your dog's ribcage girth at the DEEPEST part; it's just behind front legs Step 3: Refer to our SIZE CHART to get the right size for your dog. Note: Do NOT judge your dog's size from weight or other brands' standard If your dog's measurement is between sizes, please choose the next size up If you have size or fit issue, please contact Vivaglory team for direct help