Thank you for visiting the Mr. Peanut's Pet Clothing Department 🐾🙏🏼 Please understand that there is no standard sizing system for pet clothing. Pet clothing is based on measurements and not weight or breed. Please measure your pet and compare them to the sizing chart provided in the description of the listing. Each different style of pet clothing has its own sizing system. One style size ‘M’ can very well be another style size ‘XS’. Each listing has its own unique sizing chart and no two listings charts are the same.
As an example: if you have a Chihuahua, they may fit a size ‘M’ for one style/item, but yet a size 'XS' for another.
Please double check your pets measurements and compare to the sizing chart.