Coat Xxs

I confirm my assumption about the kind of clothes my dog?
Measurements: (this is written on the page where are the clothes that I buy, this is my first time and I have to be sure) cup of tea – 6 "neck to tail, 8-10" XXS Chest – 8 "neck to tail 10-13" chest XS – 10 "neck to tail 13-15" chest S – 12 "neck to tail 14-16" chest M – 16 "neck to tail 16-22" chest for neck of my dog ββis 7, the length (neck to tail) 12, chest 12 im going to buy my dog ββa coat for winter and I have to see if my assumption to be classified and small is correct .. Am I right? and can tell me what the numbers refer to the .. for example this .. Tea Cup – 6 "neck to tail 80-10" chest 6 is for neck and 10.8 of the length and chest?
give a little extra 4.2-inch chest xxs fits in the chest, but will not go through back. I guess if you need to consider further tightening around your chest, or if you are wanting to better fit along the back said media 6 "from the neck to the tail and the chest measurement is 8-10 "around. It is the measurement around the neck.
Mackage Brown Raffy Coat.wmv