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.
Watch as Veterinarian Dr. Katy Nelson shares all the basics of building a positive relationship with a puppy. You’ll learn everything from taking care of your puppy’s basic needs to socialization. When all is said and done you’ll learn how a happy puppy makes for a happy owner as well.
Hi, I'm Dr. Katy Nelson with IAMS, and today we're going to talk about how to take care of your puppy. First and foremost, you want to understand and meet your puppy's needs. Here they are in order of importance. Number one: basic health-- water, nutrition specifically formulated for puppies, and sleep. Also, immunizations and regular checkups are recommended. Number two: safety. As with small children, you need to keep your puppy in an environment that is safe for him. Puppies explore with their mouths, and they learn about different textures by gnawing. Also, chewing helps massage their gums. For your puppy's safety, keep things that he or she should not be chewing on out of reach. Number three: psychological. Your puppy's greatest psychological need is to be part of a group and be socialized with other dogs. However, to do this successfully, you need to be a guardian he can depend on. Once your puppy's basic needs are met, you want to understand the way he sees the world, so that you can build a strong relationship. Your puppy does not understand the world you live in, so you cannot expect him to. Two things you need to understand is that to them, everything is edible, and they will lunge at anything exciting—you, kids, guests, and other animals, until you train them not to. Praise him exuberantly to encourage the right behavior. Give him treats, pet him, play with him, and be stern to discourage the wrong behavior—ignore him, stop petting, or stop playing. Most importantly, be patient and consistent. Don't be harsh. Puppies have lots of energy, and it's healthy for them to use it. Periodically, helping your puppy release energy will minimize his urge to dig and chew on things. Spend time out in the yard making him run in short bursts. Go on walks or play fetch. Puppies are used to playing with their brothers and sisters. When they're separated, they're looking for their next playmate. Playing with your puppy will also make him more focused on you, improving your bond and making training easier. It teaches him new behaviors, self-control, and will help him gain self-confidence. Like play, socialization is also fundamental to raising your puppy. This is why socializing your puppy as soon as you bring him home is important for both of you. Socialization teaches your puppy to be calm in stimulating circumstances, and to obey when instructed. It also gets him used to being touched, handled, and even used to having hands and inedible things in and near his mouth, so that he behaves around other people, kids, and his veterinarian. Also, know that puppies are sensitive. They can read facial expressions and emotions. Be consistent about what things your puppy does that make you express happiness. Also, be careful not to give your puppy reason to think he's at blame for negative emotions you have from other areas of your life, like when you've had a bad day at work. Emotions are contagious. The happiest puppies tend to be in the most positive and loving households. I'm Dr. Katy Nelson with IAMS, and I hope that you found this helpful as you welcome your new addition to your family.