Approximate Regular bowtie sizing in Imperial/Metric:
Extra Small: 1.5 x 3.25 inches, 4.5 x 9 cms
Small: 2.25" x 4.25 inches, 2.25 x 10.75 cms
Regular Standard: 2.75 x 4.75 inches, 7 x 13 cms
Large: 3.25 x 5.25 inches, 7.75 x 15.25 cms
Extra large: 4 x 6.75 inches, 10 x 17 cms

Approximate Sailor bowtie sizing in Imperial/Metric:
Extra Small: 2" x 4", 5 x 10 cms
Small: 3" x 5", 7.5 x 12.75 cms
Regular: 4 x 6", 10 x 12.25 cms
Large: 5 x 7", 12.75 x 17.75 cms
Extra large: 6 x 8", 15.25 x 20.25 cms

The bowties are meant to attach to your dogs existing collar or perhaos a new Puppy Riot Collar! The 2 elastics are 2 elastics that slide on the collar, and the hook and loop is a VELCRO® Brand hook and loop fastener. The sizes (5/8" to 2") accompanying the fastener options refer to your pup's collar width.