Outtop Dog Cat Grid Puppy Warm T-Shirt Pet Clothes POLO Shirt Dog Coat Costume S Back Length: 27cm/10.63"; Chest: 36cm/14.17" Neck: 28cm/11.02" M Back Length: 29cm/11.42"; Chest: 38cm/14.96" Neck: 29cm/11.42" L Back Length: 31cm/12.20"; Chest: 48cm/18.90" Neck: 31cm/12.20" XL Back Length: 34cm/13.39"; Chest: 56cm/22.05" Neck: 33cm/12.99" 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.