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 Animal and Plant Health Inspection Service (APHIS) is an agency of the United States Department of Agriculture (USDA) based in Riverdale, Maryland responsible for protecting animal health, animal welfare, and plant health. APHIS is the lead agency for collaboration with other agencies to protect U.S. agriculture from invasive pests and diseases. APHIS's PPQ is the National Plant Protection Organization for the U.S., and the agency's head of veterinary services/veterinary Deputy Administrator is the Chief Veterinary Officer of the United States.