a coat for a yorkie in winter is a neccesity. they are single coated dogs and they can get frostbite. in 5 degrees their belly needs to be covered. my favorite coat is fido fleece. they are on sale at sitstay.com they are inexpensive and very warm. as far as measurements follow their measurement guide. romeo's jackets come up before his tail. if i get them to his tail he pees on them. i don't have pics. sorry my computer plug thingy is broken.
http://www.sitstay.com/store/clothing/coats1.shtml