HOW TO CHOOSE A SUITABLE DOG LIFE JACKET-These Pet life Saver Vests are available in 8 color and 6 sizes, from XS to XXL, will meet most sized dogs, from puppy to large dogs. Please measure each measurement listed on the chart before choosing a size. DO NOT judge your dog's size from weight or other brands' standard. It is also suggested to give your dog some time getting used to wearing this dog life jacket before using it in the water. OFFERING HYDROTHERAPY- ALAGIRLS dog life jacket is a great option if your dog is a bit afraid to go in the water. If you have an older dog or dog with other joint problems such as arthritis or hip dysplasia, it will be much easier to support them with a hydrotherapy when they put on a life jacket. UNIQUE DESIGN&HIGH-VISIBILITY - The dog float jacket is designed with fin shark shape to attract attention in water, it makes your dog be the focus in pool, beach, boating ,or surfing with you. And reflective stripes with bright colors to enhance maximum visibility when your beloved pets swim under the water. ADJUSTABLE & SAFETY—Adjustable belt and quick-release buckles make your dog fit comfortably, easy to put on and take off. Handle on top for quick and easy grabbing. The Heavy-duty D-ring Hook is perfect for dog leash. Convenient top grab handle for easy rescues by hand or boat hook. RIPSTOP & HIGH FLOTATION MATERIAL—The professional ripstop life jacket for dogs is made from high floatation material EPE. The shark dog lifejacket can always keep your pet head afloat above the water.