NEW Extra Small Coupler is ideal for little dogs up to 15 lbs. Overall length is 18".
Example breeds for the Extra Small Coupler:Brussels Griffons, Chihuahuas, Chinese Cresteds, E Maltese, Toy Manchester Terriers, Miniature Pinschers,Pekingese, Pomeranians, Pugs, Shih Tzus, Silky Terriers
Medium: Beagles, Basset Hounds, Jack Russel Terriers
Large/XL: German Sheperds,Sheep Dogs, Labradors, Retrievers