Most states have specific laws governing the possession of dangerous wild animals, and the liability of landowners for injuries caused by wild animals on their property. Ferae naturae is a common law doctrine (created by judges in court opinions) meaning "animals of a wild nature or disposition," and traces its origins back to the Roman empire. Under the doctrine of ferae naturae, wild animals are presumed to be owned by no one specifically, but by the people generally.

In many states the rule of law has developed that a landowner cannot be held liable for the acts of indigenous wild animals occurring on his or her property unless the landowner has actually reduced the wild animals to possession or control, or introduced a non-indigenous animal into the area.

In Washington State, the possession of dangerous wild animals is regulated by the Washington Dangerous Wild Animals Act (RCW 16.30). This act prohibits individuals from owning, possessing, breeding, or selling certain dangerous wild animals, such as big cats, bears, and nonhuman primates, without a permit. The law outlines specific requirements for obtaining a permit and conditions for maintaining such animals. Regarding liability for injuries caused by wild animals on a landowner's property, Washington follows the common law doctrine of ferae naturae. Under this doctrine, a landowner is generally not liable for injuries caused by wild animals native to the region unless the landowner has taken possession or control of the animal or introduced a non-native species that causes harm. However, if the landowner's actions, such as maintaining artificial conditions that attract wild animals, lead to an injury, they may be held liable under certain circumstances. It is important for landowners to be aware of their responsibilities and potential liabilities concerning wild animals on their property.