One to six years
The diet for a healthy, adult dog aged one to six years old is called a maintenance diet. Unless your dog is pregnant or nursing, a high-quality, complete and balanced maintenance diet is just what the doctor ordered. Of course, the quality of ingredients and the digestibility of the food will determine how much nutrition actually stays with your dog and how much simply passes through as waste. So your best value is to choose a nutrient-dense formula like PURINA ONE Chicken & Rice or Lamb & Rice. Each formula contains real meat or poultry as its number one ingredient.
Pregnant or Nursing Dogs
Like puppies, pregnant and nursing dogs are virtual muscle, bone, hair and teeth-building machines. So Purina ONE Growth and Development Formula turns out to be an ideal food for them, too. It has the extra calories and nutrients they need at a time when their bodies are under additional physical stress.
Keep in mind, food consumption may vary during pregnancy, so feed the amount needed to maintain good body condition. Unless your dog has a tendency to put on too much weight during pregnancy, she can be given all the food she wants.
Milk production is another one of the most nutritionally demanding tasks in a female's life. Food intake may double or even quadruple during lactation. Remember, a generous, ever-present supply of fresh, clean water is essential for milk production.

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