Which description best matches the definition of dangerous dogs?

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Dangerous dogs are defined by their history of causing serious harm, not by friendliness or size. The best description is a dog that has killed a companion animal or inflicted serious injury, or directly caused serious injury to a person because that level of harm demonstrates a real risk and is the trigger for dangerous-dog designation and control measures. A generally friendly dog hasn’t shown the harmful behavior, a dog that has never caused injury hasn’t proven a risk, and size doesn’t determine danger since danger is about past actions and potential for serious harm, not how big the dog is.