Outtop Dog Pet Clothes Hoodie Warm Sweater Puppy Coat Apparel S: Neck: 30cm/11.8" Length: 23cm/9.0" Chest: 32-34cm/12.6-13.4" M: Neck: 32cm/12.6" Length: 27cm/10.6" Chest: 38-40cm/14.9-15.8" L: Neck: 35cm/13.8" Length: 31cm/12.2" Chest: 45-47cm/16.5-17.7" XL: Neck: 40cm/15.7" Length: 35cm/13.8" Chest: 50-52cm/19.7-20.4" Please measure your pet size and compare with the size chart in the "Product description". Suitable size will make your pets comfortable and happy.Use similar clothing to compare with the size.