A diet to support ageing should contain antioxidants, high quality protein, reduced levels of phophorus which isn't needed in such quantity and can help to reduce the burden on the kidneys, and extra joint support for those ageing bones and joints. As your dog gets older, it’s a good idea to switch over to a diet that is lower in calories. Always speak to your vet before changing your dog’s diet. If you’re concerned that your dog is overweight, contact your vet to discuss an action plan on how best to help your dog. Changing what they eat Moving from an adult diet to one that is more suited to a senior dog is not as straightforward as it may sound. Suddenly switching to any new diet can cause your dog to have an upset stomach. When changing your dog’s diet, it’s usually best to add a small amount of new food to their current one, and gradually change the ratio of old food to new food over 7-10 days. Follow the manufacturer’s guidelines on the quantity of food to give your dog and remember to weigh it out to avoid giving them too much.