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 New Hampshire, the regulation of possession of dangerous wild animals is governed by state statutes. The New Hampshire Code of Administrative Rules, specifically Fis 804.01, outlines the species of wildlife that are prohibited from being possessed, sold, or propagated without a special permit. This includes various species of large cats, bears, primates, and other potentially dangerous wild animals. As for liability concerning injuries caused by wild animals on a landowner's property, New Hampshire 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 has introduced a non-native species that causes harm. However, if a landowner's actions, such as maintaining artificial conditions that attract wild animals, lead to an injury, the landowner may be held liable under certain circumstances. It is important for landowners to understand their responsibilities and for individuals to be aware of the regulations regarding wild animals in New Hampshire.