Cats can safely eat sardines as an occasional treat. Sardines provide beneficial nutrients such as omega-3 fatty acids, protein, taurine, vitamin D, and calcium, which help support a cat's coat, joints, bones, and overall health. However, sardines should be given in moderation, about once or twice a week, and should not replace a cat's regular balanced diet. It's important to serve fresh or canned sardines packed in water, without added salt, oil, or sauces, and to remove any bones to avoid choking hazards. Consulting a vet before making dietary changes is recommended to ensure the cat’s specific health needs are met.