Shih Tzus are a small, relatively low-energy breed, but their nutritional needs are more nuanced than their size might suggest. An adult Shih Tzu typically requires between 280 and 480 calories per day depending on age, activity level, and whether the dog has been spayed or neutered. Because they are prone to weight gain, calorie management is an important part of their dietary plan from puppyhood through their senior years.
Protein should form the foundation of a Shih Tzu's diet. Look for foods where a named animal protein is the first ingredient, as this breed benefits from lean muscle support without excessive fat content. A protein range of 18 to 25 percent is generally appropriate for adult Shih Tzus, while puppies may need slightly higher levels to support their rapid early growth.
Fat is another essential macronutrient, but it should be carefully balanced. Shih Tzus do well with moderate fat content in the range of 8 to 15 percent, which supports their luxurious coat and skin health without contributing to obesity. Omega-3 and omega-6 fatty acids are particularly valuable for this breed given the density and length of their coat.
Carbohydrates and fiber round out the dietary picture. While dogs do not require carbohydrates in the same way humans do, digestible carbohydrate sources like sweet potato, brown rice, or oats provide sustained energy and support digestive regularity. Shih Tzus can be sensitive to low-quality grain fillers, so choosing foods with whole-food carbohydrate sources is a worthwhile consideration.