All Sales Final. These light up at night time on walks with the hit of a button. Amazing glow too! Purple glows a lot like a hot pink color. It's very bright.
20" would be any size small, since you are going to cut off any excess and make it fit good for the size pet you have. Best when you want to see where your dog is in the back yard or on night walks. Dede recommends removing collars at night to rest the neck. This collar Dede recommends removing when not in use.