HOW TO CHOOSE A SUITABLE DOG LIFE JACKET—These Pet life Saver Vests are available in 4 color and 6 sizes, from XXS to XL, will meet most sized dogs, from puppy to large dogs. Please carefully read the SIZE CHART in the product pictures before purchg.If your dog is between two sizes, we suggest the larger one. PROVIDE HYDROTHERAPY—For dogs who are in the water for the first time, the dog flotation vest can help the dog overcome the psychological barrier of fear of entering the water, and it can quickly adapt to the environment in the water. And if you have an elderly pooch or a dog with other joint problems such as arthritis or hip dysplasia, it will be much easier to assist them in their hydrotherapy if they are wearing a life vest. HIGH-VISIBILITY—The dog life jacket comes with a design of bright colors and high-visibility reflective stripes, to make the dog easy to spot in the water or beach, pool, boating, surfing, rafting, kayaking. 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—High grade polyester oxford & nylon fabric, mesh fabric, pearl cotton foam. The oxford nylon fabric is ripstop, and the mesh fiber allow for quick drying and proper drainage.