How Nevada defines dangerous and vicious dogs
One criminal statute does the defining. Civil liability sits on top of it.

01What the statute does
NRS 202.500 sets out when a dog is dangerous and when it is vicious. The FindLaw text of the statute also states that a dog may not be found dangerous or vicious based solely on its breed, and that a law enforcement agency may declare a dog dangerous if its owner used it in a crime.
02Vicious dogs
A Shouse Law Group explainer on Nevada dog bite liability reports that a dog is vicious when, without provocation, it kills or inflicts substantial bodily harm on a person, or when it keeps up the behavior after its owner was told by a law enforcement agency that it is dangerous.
03Civil claims
The same explainer says an owner can still be civilly liable for negligence even if the dog never bit anyone before. a Nevada injury firm's summary adds that Nevada has no statewide automatic-liability statute and that violating a safety ordinance such as a leash law can support a negligence per se argument.
04Insurance and housing
Ask your insurer whether the dog or its breed changes your coverage and read your lease or HOA rules first. State law does not override them.
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