Here are some pictures of Loki wearing his. Sorry he's furry and it's hard to see. Romeo would definately be a "petite" size but the measurements are on the website. See how low it sits? It straps around the belly and then across the chest. I love this harness because it's a "no pull" and also because it's easy to put under sweatshirts and stuff - the leash just sticks out the front of the shirt. I don't like harnesses that attach on the back. The website is
www.premier.com.