“Vicious dog” means any of the following:
(a)
Any dog seized under Section 599aa of the Penal Code and upon the sustaining of a conviction of the owner or keeper under subdivision (a) of Section 597.5 of the Penal Code.
(b)
Any dog which, when unprovoked, in an aggressive manner, inflicts severe injury on or kills a human being.
(c)
Any dog previously determined to be and currently listed as a potentially dangerous dog which, after its owner or keeper has been notified of this determination, continues the behavior described in Section 31602 or is maintained in violation of Section 31641, 31642, or 31643.