It would be hard to tell without an x-ray. However, a broken rib will heal on it's own without any interference. We no longer wrap up broken ribs.
Why do you think the dog has a broken rib? It is unusual unless the dog was kicked or had some other trauma. Are you concerned about pain?
If you feel my answer was helpful, please click on ACCEPT. Feedback & Bonuses are always welcome. If a deposit has been made, it remains with Just Answer until you press ACCEPT. Once you press ACCEPT then I am paid.
If there is something I can further clarify, Click REPLY. Our dialog continues even after you click accept, I want to be sure your question is fully answered.