Wikipedia
Petfinder
Petfinder is a for-profit internet company that operates the largest online pet adoption website (petfinder.com, formerly petfinder.org) serving all of North America. The company reports that it currently lists “more than 315,000 adoptable pets from nearly 14,000 animal shelters and rescue groups.” It is a commercial enterprise founded in 1996, now owned by Nestlé Purina PetCare Company, and reports that it has facilitated more than 22 million pet adoptions as of 2013. Most of the pets listed on Petfinder are dogs and cats, but they list all types of animals available from shelters and rescue groups, from small fish, reptiles and birds to horses and livestock.