A Corgi vest is a light layer for warm days and evening strolls. The Corgi Summer Vest is made of a breathable, lightweight fabric, has reflective strips for low light and is machine washable. To find the right size, measure your dog’s chest at the widest point behind the front legs and the back from the base of the neck to the base of the tail, then compare both with the size chart on the product page. Between sizes? Choose the larger one.