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Contains books, pamphlets, broadsides, newspapers, periodicals, music, and graphic arts material printed in what is now the United States, as well as manuscripts and a substantial collection of secondary texts, bibliographies, and digital resources and reference works related to all aspects of American history and culture before the 20th century. Date coverage is 1684-1912.
News content from many national and international newspapers, newswires and selected news magazines including The Atlanta Journal Constitution, The Boston Global, The Chicago Tribune, The Denver Post, USA Today, The New York Times, The Wall Street Journal, The Washington Post, The Los Angeles Times, and The Christian Science Monitor. Coverage from 1980 to the present.
From Michigan State University, this site offers "a comprehensive repository of information about animal law." One of the site's main goals is "to provide an historical perspective about social and legal attitudes toward animals, and how we got to our present perspective."
This document, prepared by the Congressional Research Service, summarizes U.S. laws related to animals as of 2010. Note that, if something here proves relevant or useful to your project, it's the text of the law itself that should be your primary source--not this document. Google the name of the law to read it in full.
"Independent Voices is an open access digital collection of alternative press newspapers, magazines and journals, drawn from the special collections of participating libraries. These periodicals were produced by feminists, dissident GIs, campus radicals, Native Americans, anti-war activists, Black Power advocates, Hispanics, LGBT activists, the extreme right-wing press and alternative literary magazines during the latter half of the 20th century."
"The Library of Congress is the largest library in the world, with millions of books, recordings, photographs, newspapers, maps and manuscripts in its collections. The Library is the main research arm of the U.S. Congress and the home of the U.S. Copyright Office."