Unlike larger-breed dogs that are considered mature at age 5, medium-breed dogs are usually called mature or senior at age 7. By this time, their nutritional requirements are changing. You can help keep your medium-breed dog active, happy and healthy with a specially formulated mature or senior diet that delivers highly digestible, enhanced nutrition.
Your dog might be aging in a number of ways. He may have a dull, dry coat and flaky skin, declining activity or weight gain, decreased immune system response, more frequent intestinal problems, joint stiffness and a loss of lean muscle mass. It’s true that a mature or senior dog generally needs fewer calories, but to address special mature or senior concerns, your dog still needs high-quality protein and carefully balanced nutrients.
What your medium-breed dog needs is a high-quality, balanced maintenance food formulated for his changing metabolism. Look for options with these age-essential dietary components:
These ingredients are the keys to mature or senior nutrition whether you feed dry or wet dog food or give your dog treats.
Older, less active dogs are prone to weight gain. Controlling your dog’s weight can help minimize health complications such as diabetes or joint stress. Your dog can benefit from a weight-control diet with these key characteristics:

When, Why, and How to Start Feeding Your Pup Grown-up Nutrition
As your puppy grows into an adult dog, he needs nutrition that keeps his body as strong as your love, and that means a high-quality, premium adult formula such as IAMS™ ProActive Health™ Adult MiniChunks
Why move your grown-up pup to a premium adult dog food? Because quality counts. It's crucial to continue his superb puppy nutrition into adulthood. Downgrading to a lower-quality brand at this stage of his life may upset his digestive system, and won't provide him with the same level of nutritional excellence he was raised on.
Think of a baby. When it's time to start giving him solid food, you wouldn't dream of feeding your child anything less than the best nutrition you can buy. The same is true for your maturing puppy. He needs the best age-appropriate food there is to help maintain his overall health.
Premium foods, such as IAMS, are specifically designed to provide your dog with a food that has:
What does it all add up to? A happy, healthy dog. With premium dog food, you can expect key indicators that contribute to providing your dog with a long, healthy life:
Founded on more than 60 years of research into canine nutrition, premium formulas from IAMS help maintain your dog's health and provide him with the nutrition he needs for a long life. Basic brands may not provide these benefits or match the level of expertise that goes into every bag of dog food from IAMS.
Your puppy's transition to adult food should begin when he approaches adult height. His breed type will also help determine when to switch. Small-breed dogs tend to mature physically much sooner than large-breed dogs. Follow these guidelines to help you decide when to switch formulas:
Large- and giant-breed dogs, those weighing more than 50 pounds when fully grown, might not be ready to switch to an adult food until they're 12 to 24 months old.
To avoid upsetting your dog's intestinal tract or causing diarrhea, make the change from a puppy formula to an adult diet over a period of four days by mixing the two foods in your dog's bowl.
How much food should you give your dog? Check the daily feeding recommendations established by the pet-food manufacturer and read the label. Dan Carey, DVM and Director of Technical Communications at IAMS, suggests using the recommendations, then weighing your dog each week. If he's gaining or losing weight and shouldn't be, slightly decrease or increase his daily intake, and weigh him again in another week.
If you have specific concerns about your dog's weight, talk to your veterinarian. He or she can assess your dog's needs and give you a feeding recommendation.