Your careful choice will avoid the inconvenience of a return. Please choose the size by the measurement of your pet (The Chest and Back) not simply the weight or breeds. You can find a Size Chart on every product page. If your pet is still growing please take this into consideration when choosing the size.Size Attention:1.If any of the measurements are "between" two sizes choosing the larger size is recommended. If your measurements are toward the upper end of the range given for a particular size you may also want to choose the larger size as you may also wish to do for heavily coated dogs to accommodate all that fur. 2.Take each measurement a bit loosely so there will be room for your dog to move and breathe but not too loose. All clothes are designed in standard sizing every pet has their own body shape it is difficult to make sure all clothes can fit all the pets perfectly so we strongly advise that you need to choose size based on our size information seriously not on your experience and what you normal think about size since every product has different size defination.Please be reminded that due to lighting effects and monitors brightness/contrast settings etc. the color tone of the websites photo and the actual item could be slightly different.