Although we began making our buns for dachshunds, we soon realized a lot of people were buying them for other types of dogs. So we expanded the breeds our straps would fit and now we make them to fit any small dog with a chest circumference (distance around the largest part of the rib cage) between 13 and 23 inches. If your dog is larger than 23", we'll include velcro extenders (no charge) to fit dogs with chests up to 26". All of our buns are 5"x 15"x 2 1/2" thick on each side.