New Jersey Statutes Title 4. Agriculture and Domestic Animals 4 § 19-24

(1) to apply, at his own expense, to the municipal clerk or other official designated to license dogs pursuant to section 2 of P.L.1941, c. 151 (C. 4:19-15.2), for a special municipal potentially dangerous dog license, municipal registration number, and red identification tag issued pursuant to section 14 of this act.  1  The owner shall, at his own expense, have the registration number tattooed upon the dog in a prominent location.  A potentially dangerous dog shall be impounded until the owner obtains a municipal potentially dangerous dog license, municipal registration number, and red identification tag;

(2) to display, in a conspicuous manner, a sign on his premises warning that a potentially dangerous dog is on the premises.  The sign shall be visible and legible from 50 feet of the enclosure required pursuant to paragraph (3) of this subsection;

(3) to immediately erect and maintain an enclosure for the potentially dangerous dog on the property where the potentially dangerous dog will be kept and maintained, which has sound sides, top and bottom to prevent the potentially dangerous dog from escaping by climbing, jumping or digging and within a fence of at least six feet in height separated by at least three feet from the confined area.  The owner of a potentially dangerous dog shall securely lock the enclosure to prevent the entry of the general public and to preclude any release or escape of a potentially dangerous dog by an unknowing child or other person.  All potentially dangerous dogs shall be confined in the enclosure or, if taken out of the enclosure, securely muzzled and restrained with a tether approved by the animal control officer and having a minimum tensile strength sufficiently in excess of that required to restrict the potentially dangerous dog's movements to a radius of no more than three feet from the owner and under the direct supervision of the owner;