Every company uses different names for different sizes, for example, a size small from one company may be the same size as a large from a different company.
For this reason, we advise you to measure your dogs length (distance between neck and tail) and chest (widest part behind the front legs) as these measurements pretty much tell you all you need to know. (CHEST MATTERS MOST)
We try our best to provide the size charts from every individual company on every product, but sometimes they are not available to us.
If you have any questions regarding which size you should order for your pet, please feel free to call us at (412) 613-4085, and have your pets measurements handy!