Dog life vest uses high-quality waterproof Oxcompatibled cloth and polyethylene foam to ensure safety and firmness during use. The rib cage and neck are adjustable to fit a variety of dogs.The shark fins on the back of the Dog life jacket are made of reflective material. It ensures the fun of swimming, and it is easy to find the dog's position at night.Safety first: with a sturdy and convenient handle, it can help your dog get out of the water quickly;6 sizes (XS-XXL) products are compatibleable compatible most dogs. Please use a soft ruler to measure your dog's bust becompatiblee choosing a size. You can choose a large size if the dog is between 2 sizes.Pay attention to safety: The dog life jacket is only to assist swimming, but it is not a panacea. Please do not let the dog play alone out of your sight.