Is it good for dogs to eat tuna?

In moderation, yes. Tuna is a good source of protein and omega-3 fatty acids, which are good for dogs' skin and coat. However, it is important to note that tuna is also a high-mercury fish, so it should not be fed to dogs in large amounts. Feeding your dog tuna once or twice a week in small amounts is generally considered safe, but it is best to consult with a veterinarian before feeding your dog tuna regularly.