Onion and garlic poisoning results in oxidative damage to the red blood cells (making the red blood cells more likely to rupture) and gastroenteritis (e.g., nausea, oral irritation, drooling, abdominal pain, vomiting, diarrhea).
What breed of dogs have killed more people? The Pit bull has killed the most people, surprisingly, as they are so friendly. The second breed that has killed the most people is the Rottweiler.
With their extremely powerful jaws, they are able to inflict severe bruising, deep puncture wounds, and broken bones. Dogs used in these events often die of blood loss, shock, dehydration, exhaustion, or infection hours or even days after the fight. Other animals are often sacrificed as well; dogs who are born cold, or won't fight, may be kept around to sic other dogs on.