How to choose the right size:
Measure the circumference of the dog’s neck and then add 2″. Collars should fit comfortably on a dog’s neck. You should be able to put 2 fingers between the collar and the dog’s neck.
5/8″ widths are adjustable from 11″ to 14.5″
3/4″ widths are adjustable from 13″ to 17.5″