The day was created as a way to raise awareness for pets that need a forever home.
VIDEO: Spotify is helping shelter dogs find new homes based on owners taste in music
The American Society for the Prevention of Cruelty to Animals says more than 3 million shelter animals are adopted each year.
ABC7 News features a Perfect Pet every week, highlighting available animals at Bay Area shelters.
VIDEO: Meet this week's Perfect Pet
Click here for more videos and stories about pet adoption.