The Puppia Soft Harness is our most popular Puppia product. The chest measurement is the most important - if your pup is borderline, go a size up. Also take into account his/her fluff factor. Extremely fluffy dogs are more comfortable with a roomier harness. Super soft harness. Comfortable neck. Re-sizable chest belt. Easy snap on-off buckle. Puppia rubber label. XS-XXL.Comfortable, Cool Polyester air-mesh material. D-ring on back for leash. Machine washable, gentle cycle, air dry. Very gentle on the neck. Your dog will thank you! Leashes are also available. Neck Chest Weight XS 7-8" 10-13" 3-4 lbs S 8-10" 14-16" 5-7 lbs M 10-13" 16-19" 7-10 lbs L 13-15" 19-23" 11-18 lbs XL 15-17" 20-29" 20-29 lbs XXL 17-19 30-39