Keep your canine companion warm and dry with the Derby Originals Horse-Tough Classic 600D Mediumweight Winter Dog Coat. Available in sizes and colors to accommodate most dogs, your pet is sure to appreciate this winter dog coat. Sizes are measured from base of the neck to base of the tail, and those sizes are: small (13.5 in.) medium (17.5 in.) large (22 in.) X-large (26.5 in.) XX-large (28.5 in.) The mediumweight winter dog coat runs larger than other brands to help keep your pet's entire body protected. For the best fit, please measure your pet and refer to the size chart.