If you notice your dog might have fractured ribs, there are a few preparatory steps you might take before you head to your local vet clinic. Those include:
Muzzling the dog, but only if it doesn't affect breathing. This sounds like a weird step for many owners whose dogs aren't aggressive, but you must consider that a dog with fractured ribs will be painful and may become extremely defensive in this state.
Checking for open wounds. What you're looking for is any bone going through the skin. If you notice one, you should cover it with a clean cloth or gauze.
Avoid carrying your dog in a way that impacts the chest area. In a severe rib fracture, you may notice your dog has a bulging chest which could be hard or soft. If it's hard, it may be the end of a rib; if it's soft, your dog's lungs could be punctured and will require immediate attention by a vet.
Once you arrive at your local vet clinic, the veterinarian will take chest X-rays and ultrasounds if any lung damage is apparent.
Serious rib fractures may need to be surgically repaired.
External fixation involves the use of pins that go through the dog's skin, above and below the rib fracture. These pins then connect to one another and work as external fixators.
Internal fixation involves the use of pins, wire, plate, and screws to stabilize the broken rib(s). As the fixation procedures are surgical, anesthesia is required.