Dogs hit maturity around 7 years of age (5 years for larger dogs). It's not uncommon for them to live as long as 15 years. As your pet enters his golden years, his activity level might slow down and common conditions such as arthritis, diabetes, and kidney disease may arise. “It is so more important to monitor the eating habits of older pets,” stresses Tom Carpenter, DVM, president of the American Animal Hospital Association. “Generally, older pets do not need as much protein, sodium, and phosphorus. But your veterinarian needs to address this for your individual pet,” he says, adding that semiannual vet visits are recommended for an older animal.
Some mature dogs are prone to obesity. To test whether your dog is at a healthy weight, move your hands along his sides. If you can feel his ribs (but don't see them), he's doing okay. But if you feel a fat covering, or you visibly notice a rounded abdomen, he might be overweight. Exercise is still important for a senior dog, and if he's gained weight, you want to look for a low-fat weight-control food that contains vitamin-rich fish oils (IAMS™ ProActive Health™ Mature Adult is one good choice).
Other mature pets can become finicky eaters and lose weight as they age. 'Very old pets may actually need a more calorie-dense diet,' Carpenter says. Older dogs can lose their sense of smell and have a harder time chewing their food. To make mature dog food easier to eat, you can top their dry food with room-temperature wet food.
If your dog is gaining or losing a lot of weight, slightly decrease or increase his daily feedings. A sudden change in weight or appetite might be a sign of disease, so you should check with your vet. Water is also essential. 'Older pets are at a higher risk of dehydration,' Carpenter says. Provide a clean bowl with fresh water at all times.

Is your dog really a finicky eater, or could it be something else? There are many factors to consider when you notice that your dog doesn't seem to be eating as usual.
If you're suspicious, take a closer look at exactly what he's eating each day. Does he get the occasional dog treat, or is someone sneaking him extra table scraps?
When you feed your dog a balanced, highly nutritious diet, nothing else is needed. In fact, extra treats can drastically alter your dog's normal intake of dog food. It's similar to the feeling you get after eating too much candy or potato chips. Are you interested in a full meal? Neither is your dog.
IAMS™ dog foods are nutritionally balanced and specifically formulated to meet the needs of dogs in all life stages, and with different lifestyles. There are dry, canned, and pouch varieties, plus options for senior or overweight pets, puppies, and dogs with reduced activity levels. Talk to your veterinarian or an IAMS Pet Care and Nutrition Center professional for advice on what's best for your dog.
Recommended feeding amounts are shown on every package. The guidelines are general suggestions for the amount of food you should feed your dog. Every dog is different and does not need the same amount of food. Your dog's activity level and his metabolic makeup are the determining factors. Start with the amount given in the feeding guidelines. Then, add or subtract food as you observe your dog's eating habits and weight.
Portion-Controlled Feeding: Divide the daily amount and feed at specific intervals. It is important to take away all leftover food after 15 to 20 minutes. This sets a pattern for your dog to follow. The portion-controlled feeding method is recommended for giant and large breeds as well as for overweight dogs. Portion control also works well for dogs with special needs.
Free-Choice Feeding: Feed the daily amount and let your dog eat at leisure. This method is recommended for use only with dry foods. Remember, dogs eat to meet their energy requirements. They quickly define their own daily portions when eating free-choice.
Water: Regardless of which food you choose to feed, your dog must have plenty of fresh, clean water. A good dog feeding tip is to place the water 3 to 5 feet from the food. This will help prevent your dog from gulping water and air in addition to food.
Routine: Dogs need it. Feeding at the same time and place every day establishes a comfortable eating pattern.
The Veterinarian: Regular visits help keep your dog happy and healthy!