N.J. Stat. § 4:22-51
When a living animal or creature is impounded or confined as provided in section 4:22-19 of this title, and shall continue to be without necessary food and water for more than twelve successive hours, any person may, from time to time as often as is necessary, enter into or upon the pound in which the animal or creature is impounded or confined and supply it with necessary food and water so long as it shall remain impounded or confined. Such person shall not be liable to an action for such entry.
The actual cost of the food, water and bedding, together with twenty per cent additional, may be collected by such person from the owner of the animal or creature in an action at law, together with costs, and the animal or creature shall not be exempt from levy and sale upon an execution issued upon a judgment therefor.
N.J.S. § 4:22-51