How do I properly measure my dog?

Use a tape measure to measure your dog around the top of the neck directly behind the ears. Then use that number and the collar width to select your collar. If your dog falls within two collar sizes, get the smaller of the two. Please note, the Martingale collar has a looser fit than regular collars so that it provides a limited choke - more humane than a choke collar. If it is fit too tightly, it will be used as a choke collar.