These large rectangular-shaped dog collar nameplates are the perfect size for a Medium to Large dog. They fit a collar that is a 14" to 17" fit. Or you can say they fit a Medium to a Large size dog collar. If you order with a collar, SFGC will rivet on your collar. If you buy it alone, then SFGC will send several rivets with it. In the comment box include the text you want on the tag. You can have up to 3 lines of text. If the text you have chosen does not fit, we will notify you. Click here for a DIY easy way to install it yourself.