(a)     All vicious dogs shall be securely confined within an occupied house or residence or in a securely enclosed and locked pen or kennel, except when leashed as provided in this section. Such pen, kennel or structure must have secure sides and a secure top attached to the sides or, in lieu of a top, walls at least six feet in height and at least six feet taller than any internal structure.

(b)     All pens or other structures designed, constructed or used to confine vicious dogs must be locked with a key or combination lock when such animals are within the structure. Such structure must have a secure bottom, floor or foundation attached to the sides of the pen, or the sides of the pen must be embedded in the ground no less than two feet so as to prevent digging under the walls by the confined dog.

(c)     All structures erected to house vicious dogs must comply with all city zoning and building regulations. All such structures must be adequately lighted and ventilated and kept in a clean and sanitary condition. No vicious dog may be kept on a porch, patio or in any part of a house or structure that would allow the dog to exit such building on its own volition.

(d)     No person shall permit a vicious dog to go outside its kennel or pen unless such dog is securely leashed with a leash no longer than six feet in length. No person shall permit a vicious dog to be kept on a chain, rope or other type of leash outside its kennel or pen unless both the dog and the leash are under the actual physical control of a person 18 years of age or older.

(e)     Such dogs may not be leashed to inanimate objects such as trees, posts, buildings, or any other object or structure.

(f)     Violation of this section is a misdemeanor.