Please note that the breed guide is a suggestion only and I would always recommend measuring your dog to ensure that the coat you purchase is a good fit. There is a small degree of adjustment in the girth of coats as they fasten with velcro or an adjustable webbing strap. Therefore if your dog's measurements are only a few centimetres out from the girth stated above a standard size coat should be suitable.
I also make custom size coats and the price of the coats are based on the length of the coat. There are separate product pages for custom sizes for each of the coat styles.