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          (a) Potentially dangerous and vicious dogs have become a serious and
          widespread threat to the safety and welfare of citizens of this state.
          In recent years, they have assaulted without provocation and seriously
          injured numerous individuals, particularly children, and have killed
          numerous dogs. Many of these attacks have occurred in public places.
         
          (b) The number and-severity of these attacks are attributable to the
          failure of owners to register, confine, and properly control vicious
          and potentially dangerous dogs.
         
          (c) The necessity for the regulation and control of vicious and
          potentially dangerous dogs is a statewide problem, requiring statewide
          regulation, and existing laws are inadequate to deal with the threat
          to public health and safety posed by vicious and potentially dangerous
          dogs.
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          (a) Any dog which, when unprovoked, on two separate occasions within
          the prior 36-month period, engages in any behavior that requires a
          defensive action by any person to prevent bodily injury when the
          person and the dog are off the property of the owner or keeper of the
          dog.
         
          (b) Any dog which, when unprovoked, bites a person causing a less
          severe injury than as defined in Section 31604.
         
          Any dog which, when unprovoked, on two separate occasions within the
          prior 36-month period, has killed, seriously bitten, inflicted injury,
          or otherwise caused injury attacking a domestic animal off the
          property of the owner or keeper of the dog.
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          (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.
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          (a) This chapter does not apply to licensed kennels, humane society
          shelters, animal control facilities, or veterinarians.
         
          (b) This chapter does not apply to dogs while utilized by any police
          department or any law enforcement officer in the performance of police
          work.
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          (a) After the hearing conducted pursuant to Section 31621, the owner
          or keeper of the dog shall be notified in writing of the determination
          and orders issued, either personally or by first-class mail postage
          prepaid by the court or hearing entity. If a determination is made
          that the dog is potentially dangerous or vicious, the owne'r or keeper
          shall comply with Article 3 (commencing with Section 31641) in
          accordance with a time schedule established by the chief officer of
          the public pound or animal control department or the head of the local
          law enforcement agency, but in no case more than 30 days after the
          date of the determination or 35 days if notice of the determination is
          mailed to the owner or keeper of the dog. If the petitioner or the
          owner or keeper of the dog contests the determination, he or she may,
          within five days of the receipt of the notice of determination, appeal
          the decision of the court or hearing entity of original jurisdiction
          to a court authorized to hear the appeal. The fee for filing an appeal
          shall be twenty dollars ($20.00), payable to the county clerk. If the
          original hearing held pursuant to Section 31621 was before a hearing
          entity other than the municipal court of the jurisdiction, appeal
          shall be to the municipal court. If the original hearing was held in
          the municipal court, appeal shall be to the superior court within the
          judicial district wherein the dog is owned or kept. The petitioner or
          the owner or keeper of the dog shall serve personally or by
          first-class mail, postage prepaid, notice of the appeal upon the other
          party.
         
          (b) The court hearing the appeal shall conduct a hearing de novo,
          without a jury, and make its own determination as to potential danger
          and viciousness and make other orders authorized by this chapter,
          based upon the evidence presented. The hearing shall be conducted in
          the same manner and within the time periods set forth in Section 31621
          and subdivision (a). The court may admit all relevant evidence,
          including incident reports and the affidavits of witnesses, limit the
          scope of discovery, and may shorten the time to produce records or
          witnesses. The issue shall be decided upon the preponderance of the
          evidence. If the court rules the dog to be potentially dangerous or
          vicious, the court may establish a time schedule to ensure compliance
          with this chapter, but in no case more than 30 days subsequent to the
          date of the court's determination or 35 days if the service of the
          judgment is by first-class mail.
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          (a) If upon investigation it is determined by the animal control
          officer or law enforcement officer that probable cause exists to
          believe the dog in question poses an immediate threat to public
          safety, then the animal control officer or law enforcement officer may
          seize and impound the dog pending the hearings to be held pursuant to
          this article. The owner or keeper of the dog shall be liable to the
          city or county where the dog is impounded for the costs and expenses
          of keeping the dog, if the dog is later adjudicated potentially
          dangerous or vicious.
         
          (b) When a dog has been impounded pursuant to subdivision (a) and it
          is not contrary to public safety, the chief animal control officer
          shall permit the animal to be confined at the owner's expen,se in a
          department approved kennel ,or veterinary facility.
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          (a) No dog may be declared potentially dangerous or vicious if any
          injury or damage is sustained by a person who, at the time the injury
          or damage was sustained, was committing a willful trespass or other
          tort upon, premises occupied by the owner or keeper of the dog, or was
          teasing, tormenting, abusing, or assaulting the dog, or was committing
          or attempting to commit a crime. No dog may be declared potentially
          dangerous or vicious if the dog was protecting or defending a person
          within the immediate vicinity of the dog from an unjustified attack or
          assault. No dog may be declared potentially dangerous or vicious if an
          injury or damage was sustained by a domestic animal which at the time
          the injury or damage was sustained was teasing, tormenting, abusing,
          or assaulting the dog.
         
          (b) No dog may be declared potentially dangerous or vicious if the
          injury or damage to a domestic animal was sustained while the dog was
          working as a hunting dog, herding dog, or predator control dog on the
          property of, or under the control of, its owner or keeper, and the
          damage or injury was to a species or type of domestic animal
          appropriate to the work of the dog.
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          (a) A dog determined to be a vicious dog may be destroyed by the
          animal control department when it is found, after proceedings
          conducted under Article 2 (commencing with Section 31621), that the
          release of the dog would create a significant threat to the public
          health, safety, and welfare.
         
          (b) If it is determined that a dog found to be vicious shall not be
          destroyed, the judicial authority shall impose conditions upon the
          ownership of the dog that prot ect the public health, safety, and
          welfare.
         
          (c) Any enclosure that is required pursuant to subdivision (b) shall
          meet the requirements of Section 31605. 31646. The owner of a dog
          determined to be a vicious dog may be prohibited by the city or county
          from owning, possessing, controlling, or having custody of any dog for
          a period of up to three years, when it is found, after proceedings
          conducted under Article 2 (commencing with Section 31621), that
          ownership or possession of a dog by that person would create a
          significant threat to the public health, safety, and welfare.
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