(A) Any dangerous or vicious dog or dog having dangerous or vicious propensities and tendencies found at large after the owner thereof has previous knowledge or notice that such dog is dangerous or vicious or has dangerous or vicious propensities and tendencies may be killed by any police officer of the city without the officer having to catch or impound such dog.
(B) If any dog bites or attempts to bite any person while the dog is at large, then the dog shall be conclusively presumed to be a dangerous dog and a dog of dangerous propensities and tendencies.
(C) If any dog attacks or attempts to attack any other dog or other animal while such dog is at large, or chases or otherwise attempts to catch a person, then the dog shall be conclusively presumed to be a vicious dog and to have vicious propensities and tendencies.
(1998 Code, § 18-42)