The Chihuahua will eat boneless animal protein-based foods such as beef, lamb, bison, and pork, along with poultry items that include turkey and chicken. Throw in some fish as well. Their food, both dry and wet, should be high-quality product brands. They can have a piece of fruit or vegetable here and there, but you must remember that dogs are omnivores. It’s best to check with your veterinarian to help formulate a diet for your pet and its nutritional needs.