Available sizes and its MeasurementSmall:::::::::::Back 25Chest30Neck16Medium::::::Back 30Chest34Neck20Large::::::::::Back 35Chest40Neck24XLarge::::::::Back 40Chest44Neck26XXLarge::::::Back 43Chest50Neck28Measuring Tips:1. Measure your dog for a perfect fit. Sizing should allow room for you to put 2 fingers to fit between the cloth and pet.2. If any of the measurements are in-between 2 sizes, please go with bigger size.3. Your pups usually wear "Small Size" does not mean all "Small Size" outfit will fit your Pup.Note:1. There could be 2-3cm differs due to manual measurement.2. Due to the graphic of your gadget or monitor the actual color maybe a slightly different from the picture color.