Auburn Leather Crafters Sizing Guide (Standard Buckle and Martingale)
 
Measuring an old Buckle collar: If you are satisfied with the fit of your dog's current collar, measure that collar from the center bar of the buckle to the farthest hole. Our collars are sized according to this measurement, not to the over-all length of the collar, which varies by manufacturer and by whether it is a buckle-end or a dee-end style collar. (see diagram below):
Auburn Collar Size
 
 
 
Measuring you dog's neck: For a standard buckle collar, the collar size is approximately the distance from the center of the buckle to the last hole. To calculate the correct collar size, take the exact (comfortable) measurement around your dog's neck and add 2". This is the collar size you need.

Martingale Collar Sizing Guide

Measure carefully as these collars are sized differently than standard collars.

When measuring Martingale Round/Rolled Collars, keep in mind the collar needs to slip over your dog’s head as there is no buckle.

First, measure the widest part of your dog’s head. Next, measure your dog’s neck as you would for a standard, buckle-style collar.  Use the larger of the measurements to select a collar that fits between the ranges listed.

Collar Size
Fully Contracted
Fully Extended
10"
5 1/2"
10"
12"
7 1/2"
12"
14"
10"
14"
16"
12"
16"
18"
12"
18"
20"
14"
20"
22"
16"
22"
24"
18"
24"
26"
20"
26"