Help sizing a Martingale collar??

Hello- I am going to order a martingale collar for Meeka, and they custom make them whatever size you want, like a small is usually 8-12 inches, but you can custom that. So what is the best way to measure to give me the range I would want it to be?? I dont want it to be too loose or too tight when pulled.. this is my first martingale, so any help is welcomed! thanks!!

Here's a link to a site for sizing maringales…

i tried to find a site like this with no luck! thank you!

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