Grass Valley Animal Control has joined other animal welfare organizations in the area that list their homeless pets on Petfinder, the oldest and largest database of adoptable animals on the Internet. The site currently has more than 375,000 homeless pets listed and is updated continuously. More than 13,700 animal welfare organizations in the U.S., Canada and other countries post their pets on the site. For a complete list of shelter and rescue groups in the area, visit www.petfinder.com and scroll down the left column to “Find Animal Welfare Groups.” A potential adopter enters search criteria for the kind of pet …