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How to fit a martingale collar
Use a soft tape measure or piece of string to measure your dog's head.
Measure the largest part of your dog's head and the middle of their neck. If your dog's head is larger than their neck, you'll need a collar that can fit comfortably over their head.

pick from the following. [+] Measure your dog's neck, then measure directly where it starts to curve up from their skull. With a 23-inch (23-cm) collar, your dog's head should be about 3.2 inches (3.7 cm) long.. [+] If their neck is larger than their head, you'll need a collar that fits comfortably around their neck. Add 2 " to the largest measurement to allow for growth.. [+] Wrap a large piece of rope around their neck or use a tape measure to measure your dog's head. Make a small mark where you want your necklace to end.. [+] Double check the length of the collar. You want your desired collar to measure about 12 inches (30... The answer should be
If their neck is larger than their head, you'll need a collar that fits comfortably around their neck. Add 2 " to the largest measurement to allow for growth.