Garmin 010-12256-24 Dog Harness, Short for Virb X & XE Dogs measuring 15 inches to 25 inches (38-64 cm) should wear the short harness, and dogs measuring 26 inches to 36 inches (66-92 cm) should wear the long harness For dogs 15-25(38-64cm), measured from base of neck between the shoulder blades to the base of tail. For dogs 15-25(38-64cm), measured from base of neck between the shoulder blades to the base of tail.