A dog named Tuna, who became an internet hit with his adorably pronounced overbite and unusually crumpled chin, is now getting his very own line of merchandise. The Chihuahua-Dachsund mix – also known as a Chiweenie – was adopted in 2011 by Courtney Dasher, who shared photos on Instagram of her beloved unique-looking pup almost daily. Now his website, Tuna Melts My Heart, has more than 375,000 followers, and Courtney has set up a web shop where fans can purchase merchandise including iPhone covers, T-shirts and mugs, all branded with his one-of-a-kind face.