It seems that each item has a different size chart but that is because Baxter Boo carries different brands and each brand has their own sizing. So people need to measure carefully before ordering. I've been purchasing from Baxter Boo for over 7 years now and I can honestly say that I have never had a negative interaction with customer service. They answer the phone in a reasonable time and are helpful. On the down side, I think their shipping costs are too high! Otherwise, I'm a happy Baxter Boo shopper. Almost forgot…the clothes for dogs are made of quality materials. They will last forever unless you have a dog that likes to tear up clothes.