This martingale will adjust to fit a neck size of 12 - 18 inches.
Need a longer or shorter length... just let me know in "note to seller".
All of my martingales are made with 100% cotton medium weight fabric. I think cotton offers more comfort and in my opinion has less risk of slipping over the dog’s head when control is needed. I prewash all fabric before construction. When your collar is washed it will not twist or bunch and will look like new again.