Like puppies, pregnant and nursing dogs are virtual muscle, bone, hair and teeth-building machines. So Purina ONE Healthy Puppy 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.