Tuna is a Chihuahua/Dachshund mix who rose to fame on Instagram for his unique appearance, featuring an adorable overbite and wrinkly skin. With over 2 million followers on social media, Tuna has become a beloved internet celebrity known for his goofy expressions and heartwarming personality. He has even released a book, “Tuna Melts My Heart,” which chronicles his journey from a rescue dog to a global sensation.