Sizing guide: Measure pet’s girth around the broadest part of the chest and add 2". If the measurement is between sizes or if the pet has a stouter build, select the next size up for a proper fit. Example, if you measure aroud girth and it's 16"+2" = 18". You would need a Small/Medium instead of an X-Small. Any questions, Please give me a call.
X-Small fits girths 7"-16"
Small/Medium fits girths 12"-28"
Large fits girths 28"-36"
X-Large fits girths 32"-44"