To reduce the burden on the liver and kidneys, as well as to prevent pet obesity, older dogs should eat fewer calories, proteins, and fats. Meanwhile, the number of carbohydrates should be increased.
In some cases, it's possible to keep the pet on the same diet but to cut the portion size.
If the dog has any health issues, it should be introduced to a diet based on dog food's specialty lines.
Sometimes, because of problems with the teeth, it can be difficult for the dog to chew hard granules. In such a case, pre-soak them in a small amount of water.
If the dog completely refuses to eat, you should immediately examine it with a veterinarian. If no health issues are found, you can try to feed your dog with another type of food.
It is important to remember that older dogs need extra vitamins and minerals. Supplements to food help to prevent or at least reduce the symptoms of such age-related diseases as arthritis. Some dog owners also give their pets antioxidants, which help cleanse the body of harmful substances.