In this section the following words have the meanings indicated. “Dangerous dog” means a dog that: without provocation has killed or inflicted severe injury on a person; or is determined by the appropriate unit of a county or municipal corporation under subsection (c) of this section to be a potentially dangerous dog and, after the determination is made: bites a person; when not on its owner’s real property, kills or inflicts severe injury on a domestic animal; or attacks without provocation. “Owner’s real property” means real property owned or leased by the owner of a dog. “Owner’s real property” does not include a public right-of-way or a common area of a condominium, apartment complex, or townhouse development. “Severe injury” means a physical injury that results in broken bones or disfiguring lacerations requiring multiple sutures or cosmetic surgery. This section does not apply to a dog owned by and working for a governmental or law enforcement unit. An appropriate unit of a county or municipal corporation may determine that a dog is potentially dangerous if the unit: finds that the dog: has inflicted a bite on a person while on public or private real property; when not on its owner’s real property, has killed or inflicted severe injury on a domestic animal; or has attacked without provocation; and notifies the dog owner in writing of the reasons for this determination. A dog owner may not: leave a dangerous dog unattended on the owner’s real property unless the dog is: confined indoors; in a securely enclosed and locked pen; or in another structure designed to restrain the dog; or allow a dangerous dog to leave the owner’s real property unless the dog is leashed and muzzled, or is otherwise securely restrained and muzzled. An owner of a dangerous dog or potentially dangerous dog who sells or gives the dog to another shall notify in writing: the authority that made the determination under subsection (c) of this section, of the name and address of the new owner of the dog; and the person taking possession of the dog, of the dangerous behavior or potentially dangerous behavior of the dog. A person who violates this section is guilty of a misdemeanor and on conviction is subject to a fine not exceeding $2,500.