Medium: Start of Buckle to First Hole 15.5" to Last Hole 18.5 Inches .Full Length 21-INCHES
Large : Start of Buckle to First Hole 18" to Last Hole 21.5 Inches .Full Length 24-INCHES
Extra Large : Start of Buckle to First Hole 20.5" to Last Hole 23.5 Inches .Full Length 26-INCHES
There is a space for ONE HOLE if needed
Please allow 0.5" earror becaue of Handmade Collar
Collars are handmade using 100 Percent Genuine Leather
PLEASE FEEL FREE TO ASK FOR ASSISTANCE AND HELP.