Ok, this might help convince him... I found this statute in California law. I suppose it is subject to interpretation, but I think this is the same law they used in NYC in that Animal Cops (or was it Animal Precint) show that I said earlier.
http://www.leginfo.ca.gov/cgi-bin/di...&file=594-625c
Penal Code 597.1 Failure to care for animals
(b) Except as otherwise provided in subdivision (a) or (c), every
person who overdrives, overloads, drives when overloaded, overworks,
tortures, torments, deprives of necessary sustenance, drink, or
shelter, cruelly beats, mutilates, or cruelly kills any animal, or
causes or procures any animal to be so overdriven, overloaded, driven
when overloaded, overworked, tortured, tormented, deprived of
necessary sustenance, drink, shelter, or to be cruelly beaten,
mutilated, or cruelly killed; and
whoever, having the charge or
custody of any animal, either as owner or otherwise, subjects any
animal to needless suffering, or inflicts unnecessary cruelty upon
the animal, or in any manner abuses any animal, or fails to provide
the animal with proper food, drink, or shelter or protection from the
weather, or who drives, rides, or otherwise uses the animal when
unfit for labor, is, for every such offense, guilty of a crime
punishable as a misdemeanor or as a felony or alternatively
punishable as a misdemeanor or a felony and by a fine of not more
than twenty thousand dollars ($20,000).