An authorised person must seize a dangerous dog—
(a) if—
(i) the keeper of the dog has contravened a condition of a dangerous dog licence in force for the dog; and
(ii) the authorised person reasonably believes, having regard to the safety of the public, that the contravention justifies the seizure; or
(b) if a dangerous dog licence is not in force for the dog; or
(c) if the dangerous dog licence in force for the dog is cancelled.