Meet Tuna, the Chihuahua-Dachshund mix who has melted the hearts of 375,000 Instagram followers and now has his own line of merchandise

Tuna – who suffers from an aggressive overbite and lower jawline dysfunction, was first found on the side of the road in San Francisco, California, where his original owners apparently discarded him. When Courtney discovered the four-month-old puppy in a local farmers market, she was immediately smitten.