Mississippi Code Title 19. Counties and County Officers § 19-5-50

(1) The governing authorities of any county bordering on the Gulf of Mexico and having within its boundaries two cities having in excess of forty thousand (40,000) population each, according to the 1970 United States decennial census and of any county bordering on the Pearl River having two (2) judicial districts, wherein is housed the seat of state government, wherein U.S. Interstates 55 and 20 interchange and having a population in excess of two hundred thousand (200,000), according to the 1970 federal decennial census, shall have the power to prevent or regulate the running at large of animals of all kinds, and to cause such as may be running at large to be impounded and sold to discharge the costs and penalties provided for the violation of such regulations and the expense of impounding and keeping and selling the same; to regulate and provide for the taxing of owners and harborers of dogs, and to destroy dogs running at large, unless such dogs have proper identification indicating that said dogs have been vaccinated for rabies; and to provide for the erection of all needful pens, pounds, and buildings for the use of the county, and to appoint and confirm keepers thereof, and to establish and enforce rules governing the same.

(2) The governing authorities of any county bordering on the Gulf of Mexico and having within its boundaries two (2) cities having in excess of forty thousand (40,000) population each, according to the 1970 federal decennial census, and of any county bordering on the Gulf of Mexico and the State of Alabama in which there is a shipyard which constructs oceangoing vessels, and any county bordering on the Gulf of Mexico and the State of Louisiana and through which U.S. Interstate Highway 10 runs, shall have the power to prevent or regulate the running at large of animals of all kinds, and to cause such as may be running at large to be impounded and sold to discharge the costs and penalties provided for the violation of such regulations and the expense of impounding and keeping and selling the same; to regulate and provide for the taxing of owners and harborers of dogs, and to destroy dogs running at large unless such dogs have proper identification indicating that said dogs have been vaccinated for rabies; and to provide for the erection of all needful pens, pounds and buildings for the use of the county, and to appoint and confirm keepers thereof, and to establish and enforce rules governing the same.