
Proposition 6 was an initiative statute that appeared on the November 3, 1998 California general election ballot. It was passed with 4,670,524 Yes votes, for 59.4 percent of the total votes cast. The proposition added sections 598c and 598d to the California Penal Code, making it a felony for any person in the state to possess, transfer, receive, or hold a horse with the intent to kill it, or have it killed, where the person knows, or should have known, that any part of the carcass will be used for human consumption. An additional provision makes it a misdemeanor to sell horse meat within the state as meat intended for human consumption. The law further allows for anyone previously convicted of selling horsemeat to be charged with a felony in any future prosecutions for the same offense. Only about one percent of California horses were previously slaughtered for horsemeat, primarily for export to markets in Belgium, France, Italy, and Japan. Horsemeat is rarely eaten by people in the United States.

Proposition 204 of 2006 was a law enacted by the voters of Arizona by means of the initiative process. It requires that pigs and calves used for veal on factory farms be given enough room to turn around and fully extend their limbs. The Act was approved in a vote held as part of the 2006 Arizona state elections, held on November 7. It passed with over 62% support.

Proposition 2 was a California ballot proposition in that state's general election on November 4, 2008. It passed with 63% of the votes in favor and 37% against. Submitted to the Secretary of State as the Prevention of Farm Animal Cruelty Act, the initiative's name was amended to officially be known as the Standards for Confining Farm Animals initiative. The official title of the statute enacted by the proposition is the Prevention of Farm Animal Cruelty Act.

An Act to Prevent Cruelty to Farm Animals, more commonly known as Question 3, was the third initiative on the 2016 Massachusetts ballot. The measure will require Massachusetts farmers to give chickens, pigs, and calves enough room to turn around, stand up, lie down, and fully extend their limbs. It will also prohibit the sale of eggs or meat from animals raised in conditions that did not meet these standards.

Proposition 7 was a California ballot proposition in that state's general election on November 6, 2018. The measure passed, by a vote of about 60% Yes to 40% No.

Proposition 12 was a California ballot proposition in that state's general election on November 6, 2018. The measure was self-titled the Prevention of Cruelty to Farm Animals Act. The measure passed, by a vote of about 63% Yes to 37% No.

The Animal Enterprise Terrorism Act (AETA) of 2006 is a United States federal law that prohibits any person from engaging in certain conduct "for the purpose of damaging or interfering with the operations of an animal enterprise." The statute covers any act that either "damages or causes the loss of any real or personal property" or "places a person in reasonable fear" of injury.

The Animal Welfare Act was signed into law by President Lyndon B. Johnson on August 24, 1966. It is the main federal law in the United States that regulates the treatment of animals in research and exhibition. Other laws, policies, and guidelines may include additional species coverage or specifications for animal care and use, but all refer to the Animal Welfare Act as the minimally acceptable standard for animal treatment and care. The USDA and APHIS oversee the AWA and the House and Senate Agriculture Committees have primary legislative jurisdiction over the Act. Animals covered under this Act include any live or dead cat, dog, hamster, rabbit, nonhuman primate, guinea pig, and any other warm-blooded animal determined by the Secretary of Agriculture for research, pet use or exhibition. Excluded from the Act are birds, rats of the genus Rattus, mice of the genus Mus, farm animals, and all cold-blooded animals.

The Bald and Golden Eagle Protection Act is a United States federal statute that protects two species of eagle. The bald eagle was chosen as a national emblem of the United States by the Continental Congress of 1782 and was given legal protection by the Bald Eagle Protection Act of 1940. This act was expanded to include the golden eagle in 1962. Since the original Act, the Bald and Golden Eagle Protection Act has been amended several times. It currently prohibits anyone, without a permit issued by the Secretary of the Interior, from "taking" bald eagles. Taking is described to include their parts, nests, or eggs, molesting or disturbing the birds. The Act provides criminal penalties for persons who "take, possess, sell, purchase, barter, offer to sell, purchase or barter, transport, export or import, at any time or any manner, any bald eagle ... [or any golden eagle], alive or dead, or any part, nest, or egg thereof."

The Horse Protection Act of 1970 (HPA); is a United States federal law, under which the practice of soring is a crime punishable by both civil and criminal penalties, including fines and jail time. It is illegal to show a horse, enter it at a horse show, or to auction, sell, offer for sale, or transport a horse for any of these purposes if it has been sored.

The Humane Slaughter Act, or the Humane Methods of Livestock Slaughter Act is a United States federal law designed to decrease suffering of livestock during slaughter. It was approved on August 27, 1958. The most notable of these requirements is the need to have an animal completely sedated and insensible to pain. This is to minimize the suffering to the point where the animal feels nothing at all, instead blacking out and never waking. This differs from animal to animal as size increases and decreases. Larger animals such as bovines require a stronger method than chickens, for example. Bovines require electronarcosis or something equally potent, though electronarcosis remains a standard. The bovine would have a device placed on their head that, once activated, sends an electric charge that efficiently and safely stuns them. Chickens, on the other hand, require much less current to be efficiently sedated and are given a run under electrically charged water. To ensure that these guidelines are met, The Food Safety and Inspection Service inspectors at slaughtering plants are responsible for overseeing compliance, and have the authority to stop slaughter lines and order plant employees to take corrective actions. Although more than 168 million chickens and around 9 billion broiler chickens are killed for food in the United States yearly, the Humane Slaughter Act specifically mentions only cattle, calves, horses, mules, sheep and swine.

The Marine Mammal Protection Act (MMPA) was the first act of the United States Congress to call specifically for an ecosystem approach to wildlife management.

The Wild and Free-Roaming Horses and Burros Act of 1971 (WFRHBA), is an Act of Congress, signed into law by President Richard M. Nixon on December 18, 1971. The act covered the management, protection and study of "unbranded and unclaimed horses and burros on public lands in the United States."