There are two main types of chicken breast meat: chicken breast and chicken fillet. Chicken fillet is often used as a freeze-dried dog training treat and is found on the side of the chicken breast. Freeze-dried chicken breast dog treats have a high protein composition, making them a great source of protein and a low-calorie food option. In fact, meat is one of the largest sources of protein, making it an ideal food for those looking for high-protein, low-calorie options.