*Size information* Size XXL, fits Chest23" and Back18". *Recommend breeds* Small breeds of dog, such as Chihuahua, Pomeranian, Yorkshire Terrier. *Measuring Your Dog for a Perfect Fit* Step1. Measure your pet correctly with a tape and write it down. Chest girth : Measure the chest at its widest point all the way around Back length: Measure length of pet's back from the base of the neck to the base of the tail.(Excluding the tail) Step2. Determine what type of the clothes you will purchase. For tops(such as dresses,shirts and coats without legs),the chest girth is the most important,please be sure the chest of a clothes can fit your pet. Slightly shorter or longer back length will be OK,but not too short or too long. For jumpsuit with legs,we should pay attention to both chest girth and back length.We don’t recommend to choose a clothes with a back length 2 inch shorter or longer than the back length of your dog. Step3. Check the size table on the product page and determine what size you need. 1.If any of the measurements are 'between' two sizes, choose the larger size.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. Take each measurement a bit loosely, so there will be room for your dog to move and breathe, but not too loose. (the measurement for belly bands is the exception -- it needs to be a bit snug) .