These are a great protein source, and are full of omega-3 fatty acids. What’s more, sardines also have Vitamin D, Calcium, Vitamin B-12 and the antioxidant selenium. Being low on the food chain and feeding on plankton, sardines are among the safest, healthiest ocean foods for your pet. Ideal for a bite sized snack, or a high value training treat, we know that your pet will love these delicious morsels.