Size S, Length 26, neck circumference 37-47, bust circumference42-53 Size M, Length 35, neck circumference 40-52, bust circumference51-66 Size L, Length 43, Nneck circumference 47-64, bust circumference63-80 XL size, length 51, neck circumference 55-77, bust circumference 78-99. Control Handle and D-ring --- The cooling vest for dogs comes with soft handle on the top to provide better control for you, help to guide your dog. The back sturdy metal D-ring can distribute pulling pressure evenly to the whole body to prevent choking. Reflective Strip for Safety --- The reflective strip design on the cooling dog vest greatly enhances their dog's safety and reduces potential safety risks. Nylon Loop for light installation to provide extra safety and visibility. Easy to Use --- Soak the dog cooling vest harness in water. Wring out the excess water of the cool clothes. Put ice pack into the pocket. Put it into the fridge and freeze for 10 minutes. Put it on your dog. Note: If the dog has an upset stomach, it is not recommended to use ice pack to avoid catching a cold. Adjustable & Multiple Sizes --- The hidden buckles on both sides of the dog cooling jacket make it easy to put on and take off. Adjustable buckles on the neck and belly allow you to adjust it to fit your dog's body, keeping it snug and not easy to shift. Available in 4 sizes from S to XL to suit various breeds and sizes of dogs. Please measure your dog's back, chest, and neck before ordering and choose from the corresponding size chart.