The terms used in this article are defined as follows:
Any dog with a propensity, tendency or disposition to attack, cause injury or otherwise endanger the safety of human beings or other domestic animals as evidenced by its habitual or repeated chasing or snapping, or barking and/or snarling in a threatening manner.
Any dog which attacks a human being or another domestic animal without provocation.
Any dog owned or harbored primarily or in part for the purpose of dog fighting, or any dog trained for dog fighting.
Any pit bull dog.