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:

Pregnancy and nursing are not only responsible for many changes in a dog's body, but for changes in her lifestyle as well. If your dog is pregnant or nursing, pay special attention to her changing nutritional needs as she carries, delivers and nurses her puppies.
If you're planning to breed your female dog, it’s important to assess her body condition well in advance of breeding. Because of the physical demands of pregnancy and nursing, a dog with less-than-ideal health can experience problems:
Be sure to feed the proper amounts of a complete and balanced diet. This will support the mother's healthy weight and body condition before breeding and help maintain her health and that of her babies throughout pregnancy and lactation.
The gestation period for dogs is nine weeks. Pregnant dogs gain weight only slightly until about the sixth week, and then gain weight rapidly.
The energy requirements of pregnant dogs are reflected in the pattern of weight gain. Pregnant dogs will need to consume 25% to 50% more than their normal food intake by the end of pregnancy, but energy requirements do not increase until about the sixth week.
The best diet for pregnant and nursing dogs is a high-quality, nutrient-dense pet food formulated for all life stages or for growth. Although puppy diets are generally recommended for pregnant or nursing dogs, large-breed puppy formulas may not be appropriate for this use due to their adjusted energy and mineral content.
Pregnant dogs lose weight after giving birth, but their nutritional needs increase dramatically. Depending on litter size, nursing dogs might need two to three times their normal food requirement to nourish their pups. Be sure your nursing mom has plenty of water so she can generate the milk volume she needs to feed the litter.
To help your nursing dog get enough nutrition, you can try several tactics:

By four to five weeks after birth, most puppies are showing an interest in their mother’s food. Gradually, the puppies will begin eating more solid food and nursing less. At the same time, the nursing mother will usually begin eating less. Most puppies are completely weaned around age 7 to 8 weeks. By this time, the mother's energy requirement is back to normal, and she should be eating her normal pre-pregnancy diet.