Oregon Revised Statutes Animals § 609.098

(a) Without provocation and in an aggressive manner inflicts serious physical injury, as defined in ORS 161.015, on a person or kills a person;

(b) Acts as a potentially dangerous dog, as defined in ORS 609.035, after having previously committed an act as a potentially dangerous dog that resulted in the keeper being found to have violated ORS 609.095; or

(c) Is used as a weapon in the commission of a crime.