The Tenth Amendment to the Constitution of the United States gives the states (and thus political subdivisions like counties, cities, towns and villages) the power to enact virtually any laws they wish that are reasonably related to the public health, safety and welfare. On the other hand, neither at the state nor federal level is there any constitutional right to foster the breeding of countless numbers of unwanted dogs and cats.
Thus, a potentially effective weapon in the war on overpopulation is the use of spay/neuter legislation-and ISAR will continue to develop appropriate laws.