Measure the Chest Girth, Back Length, Neck Girth of your pet and compare to the size chart before placing an order, leave 2-3 fingers of space for best fit and comfort. Just add water to start the effect of this evaporative cooling vest for dogs. Liquid water to water vapor, temperature drops, bring your dog ice feel. This puppy cooling shirt also prevents the strong sunlight from hot summer and makes dog feel like in cool swamp. HOW TO USE COOLING T-SHIRT-1. Soak the dog vest in cool or cold water. 2. Wring the water out before putting it on your dog. 3. Put this pet cooling vest on your dogs. Perfect for many occasions: walking outdoor, sleep, and daily wear. This dog ice vest comes with elastic leg brims and pullover design, easy to put on and take off. Our cooling shirt for dogs are machine washable and air dry, and will not fade or tear after washed. With this cool pet tshirt, pet owner can then take their furkids to the beach, hiking, training, walking without any worry. Lightweight summer cooling shirt is the perfect way to keep pet cool. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!