X-Small: 6 in. by 5.25 in. with 1.5 in. collar opening
Small: 9.5 in. by 6.75 in. with 1.5 in. collar opening
Medium: 11.25 in. by 8.25 in. with 2.25 in. collar opening
Large: 12.5 in. by 9.25 with 2.5 in. opening
If you are unsure of what size to order, please send us a message with a picture of your pup! Remember: these bandanas slip on your pups collar so the measurements do NOT need to measure around the entire neck. If your pup is in-between sizes I always recommend sizing up.