Tuna is a Chihuahua Dachshund crossbreed dog, best known as an internet celebrity, and an internet meme. He was abandoned by his original owner near San Diego, and was adopted at a farmer's market in Los Angeles by Courtney Dasher. After she created an Instagram page for him, a photo of him was featured on the company's website resulting in an increase in followers. Dasher has used Tuna's celebrity status to raise money for animal rescue groups and to promote animal welfare generally. A book of photographs of Tuna was released in 2015, entitled Tuna Melts My Heart: The Underdog With The Overbite.