Both fish and meat can be healthy for dogs, as they provide different nutritional benefits. Fish is a good source of omega-3 fatty acids, which can help reduce inflammation, improve brain function, and support healthy skin and coat. Some types of fish, such as salmon, are also high in protein, vitamins, and minerals like vitamin D and selenium. Meat, on the other hand, is a good source of protein and essential amino acids that dogs need to build and repair muscle, bone, and other tissues. Meat also contains iron, zinc, and other important minerals that dogs need for overall health. It's important to note that not all types of fish and meat are created equal when it comes to nutritional value. Some types of fish, such as tuna, can be high in mercury, which can be harmful in large amounts. Similarly, some types of meat, such as processed meats like hot dogs or deli meat, can be high in salt and preservatives. Overall, a healthy and balanced diet for dogs should include a variety of protein sources, including both fish and meat, as well as fruits and vegetables to provide essential vitamins and minerals.