Dogs in Play Multi-Function LED Lighted Dog Collars - Small 10" - 14" long, 3/4" wide Small collars: 10" - 14" long, 3/4" wide (works for toy breeds, small dogs, and cats) Three different light settings allow you to choose based on your activity - Steady On (non-flashing), Slow Flashing, Quick Flashing. Correct Collar Size: The sizes listed above indicate the maximum size with the buckle fastened. Measure your pet's neck before ordering. You may wish to add 1" - 2" to the measurement for your dog's comfort.