HOW TO MEASURE YOUR DOG
All dogs are different and vary in their size, just as people vary in size and shape. Here is a general guideline to fit your dog appropriately for a dog collar. For a proper fit, measure your dog's neck with a cloth seamstress tape measure.
• Pull the tape snug but not tight. (If you do not have a tape measure, you can use a piece of string and then measure the string with a rigid ruler.)
• When the collar is on his neck it should allow you to slide two fingers under a properly fitting collar and your dog's neck. If there's extra room, you need a smaller size. If both fingers don't fit, the collar is too small
A collar shouldn't be tight around your dog's neck and therefore it will not be the exact measurement of your dog's neck. For safety reasons - so it doesn't snag on something, it shouldn't be too loose either. A snug fit is what you are aiming for and not a tight one or one that chokes. Always monitor your furry little friend while he or she is on their leash with a collar, so they don't get caught on a fence or other environmental object that would cause furry friend choking.