From the May 7, 1915, issue of the New York Times:

100 CATS GUARD
NEW YORK POLICE

Rats and Mice Routed by
Valient Representatives
of the Feline Tribe

MEN NOW SLEEP IN PEACE

Station House Pets Credited
with Wisdom Far Beyond
Average of Their Species

New York police force is the owner of more than 100 cats, distributed among the various station houses where they have their own police duty to perform. This consists of ridding the houses of mice and rats.