We have 3 sizes to choose from, medium large dog collar length can be adjustable.
Medium size:(length: 14-18 inch, width:1 inch)
Large size:(length: 18-21 inch, width:1 inch)
X-Large size:(length: 21- 24.5inch, width:1 inch)
Measure your dog's neck before purchase, using a soft measuring tape or piece of string.Make sure buy right size dog collar.