Your careful choice will avoid the inconvenience of returns. Please choose the size according to the measurements of your pet (body length and chest), not just weight or breeds. You can find the sizing option on each product page. If your pet is still growing, please take this into account when choosing a size. Size Note: 1. If any of the measurements are between two sizes, it is recommended to choose the larger size. If your measurements are towards the upper end of the range given for a particular size, you may also want to choose the larger size, as you may also want to do for dogs with heavy coats to accommodate all the fur. 2. Take each measurement slightly loose, so that your dog has room to move and breathe, but not too loose. The clothes are designed in standard size, every pet has its own body size, it's hard to make sure every clothes can fit all pets perfectly, so we strongly recommend that you need to choose the size based on our size information, not your experience and what you think about the size because every product has different size.