Dogs in Play Red Multi-Function LED Lighted Dog Collar - Small Collar (10-14" L, 3/4" W) Small Collar (10-14" L, 3/4" W) 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. Don't forget to buy a matching leash!