Foods that are rich in Omega-3, Omega-6, and biotin are great for maintaining good nail health. Luckily for your pup, these three nutrients are easy to supply in their food. Biotin, for example, is found in a range of animal products, including meat, fish, and eggs. Biotin is also found in leafy green vegetables, which can be added to your dog's meal - consider including chopped Swiss chard, lettuce, spinach, kale, or cabbage to your dog's dinner every so often. Just be sure to monitor your pup for diarrhea and gas, and only give these greens in moderation to prevent digestive upsets. Similarly, Omega-6 fatty acids are found in both animal and plant products. Vegetable oils like rapeseed, sunflower, and corn oils are rich in Omega-6 fatty acids. Also, meat, poultry, fish, and eggs are rich in Omega-6. Lastly, Omega-3 fatty acids are found in fatty fish like salmon, mackerel, anchovies, and sardines. Fish oil supplements are readily available online and in pet stores.