When selecting the best wet dog food for weight gain, it’s crucial to choose options rich in high-quality protein and healthy fats. Brands like Blue Buffalo Homestyle Recipe, Wellness CORE Grain-Free, and Merrick Grain-Free are excellent choices. These formulas contain real meat as the primary ingredient, ensuring sufficient protein for muscle development. Additionally, they include healthy fats from sources like salmon oil or chicken fat to promote weight gain. Look for foods with added vitamins and minerals to support overall health. Avoid fillers and artificial additives, which can hinder nutrient absorption. These nutrient-dense foods can help underweight dogs achieve a healthy weight.