The Dear Dog Dot Harness is New to the collection, it has an extendable strap at the front to give comfort and support, the price includes a matching tangle free lead. Small Neck 8" (20cm) Breast 11"-14" (28-36cm)Medium Neck 10" (25cm) Breast 15"-17" (38-43cm)Large Neck 12" (30cm) Breast 18"-20" (45-51cm)XLarge Neck 14" (36cm) Breast 21"-23" (53-58cm)XXLarge Neck 16" (41cm) Breast 24"-26" (61-66cm)