"On this site you will find a comprehensive repository of information about animal law, including: over 1200 full text cases (US, historical, and UK), over 1400 US statutes, over 60 topics and comprehensive explanations, legal articles on a variety of animal topics and an international collection."
National Ag Law Center: Animal Welfare
Includes a good overview on animal welfare in agriculture with lists/links of federal statutes, regulations and cases, CRS Reports and other publications.
From The Animal Legal Defense Fund: "This eighth edition of the Animal Protection Laws compendium contains the general animal protection and related statutes for all of the states, principal districts and territories of the United States of America, and for all of Canada. In Canada, the federal government enacts all criminal laws, which are applicable throughout the country. The provinces and territories of Canada may enact quasi-criminal offenses and laws in other subject areas, and have jurisdiction over most criminal and civil matters."
As the first humane organization to be granted legal authority to investigate and make arrests for crimes against animals, we are wholly dedicated to fulfilling the ASPCA mission through nonviolent approaches. Our organization provides local and national leadership in three key areas: caring for pet parents and pets, providing positive outcomes for at-risk animals and serving victims of animal cruelty.
The Humane Society of the U.S. "and affiliates provide hands-on care and services to more than 100,000 animals each year" and " professionalize the field through education and training for local organizations."