Exposing poisonous substances where liable to be eaten by beasts—Any person who shall expose any known poisonous substance, whether mixed with meat or other food or not, so that the same shall be liable to be eaten by any horses, cattle, dogs or other beasts of another, shall be guilty of a misdemeanor: Provided, That it shall not be unlawful to expose on one’s own premises common rat poisons mixed only with vegetable substances, nor for any person to expose on his own premises, not within the limits of any incorporated city or village, poisons for the destruction of predatory or dangerous prowling animals.