Small: 6" wide by 6" tall Medium: 8" wide by 8" tall Large:10" wide by 10" tall
Attachment: Elastic --> closed loops. Attaches to a collar which is fed through the loops. Velcro --> open loops. Velcro straps wrap around a collar and fasten to size. Alligator Clip --> Single clip, most commonly used to attach to your pup's fur as a standalone accessory.