Thank you for viewing! This is a brand new, unopened item. [Insect Repellent & Cooling Treatment] This is a T-shirt with a simple design that still highlights the AVIREX brand. *The size chart is based on the dog's body size. The clothing size may vary slightly depending on the material and design. Also, the weight is an approximate guideline, so please choose based on the back length, chest circumference, and neck circumference. #AVIREX #PetClothes #NewUnused #SizeM