My 80lb fluffy pittie/Australian Shepherd mix has a ton of skin issues and allergies, to the point where he will bite at his behind, no matter the allergy medicine and the prescription food. We have struggled with finding clothing that can cover his behind to keep him from doing it. These pajamas are PERFECT for his issues! It covers around his tail perfectly! I am so happy with this purchase, and plan to buy more! 100% recommend. Also, this is an XL for reference!