Food for Pregnant and Nursing Dogs: When to Switch Diet
A pregnant dog does not need more food early in pregnancy: her energy requirement only rises in the last trimester, when intake increases by 30% to 60%, depending on litter size. The FEDIAF guidelines (2021), reproduced in the Veterinary Nursing Journal, set the starting point at 132 kcal per kg of body weight raised to the 0.75 power in the first five weeks, with an increase after that. In nursing, the calculation starts at 145 kcal per kg^0.75 and adds a term that grows with the number of puppies and with the week. The exact amount is set by the veterinarian, who sees the weight, body condition and litter of that particular dog.
This guide shows when it makes sense to switch to a puppy food, why nursing is the heaviest phase and what calcium changes. To compare growth formulas already filtered, open the dog food ranking.
What should a pregnant dog eat?
In the first two trimesters, a complete adult food keeps the dog's body condition ideal. According to the Veterinary Nursing Journal, canine pregnancy lasts 63 days on average and is divided into three trimesters, and the need for energy does not rise before the last one.
What matters in this phase is the quality of the diet. The Merck Veterinary Manual lists two AAFCO profiles: adult maintenance, and growth and reproduction. Reproduction (pregnancy and nursing) is covered by the second profile.
When should you switch to puppy food during pregnancy?
In the last trimester, the 30% to 60% increase in intake, which varies with litter size, can be met by switching to a complete food formulated for growth, according to the Veterinary Nursing Journal. The FEDIAF (2021) table already adds energy after the fifth week, and the veterinarian defines the exact moment of the switch for each dog.
The switch is arranged with the veterinarian. In the same source, growth foods for large breeds appear as unsuitable for pregnancy and nursing: they limit fat, energy and calcium to slow the puppy's growth. For a large-breed dog, choose a puppy formula that is not specific to large breeds.
In our catalog, four high-energy formulas for puppies show the range of values in this category:
| Dog food | Energy (kcal/kg) | Protein (%) | Fat (%) |
|---|---|---|---|
| Purina Pro Plan Puppy Shredded Blend Chicken & Rice | 4,167 | 28 | 18 |
| Purina ONE +Plus Healthy Puppy Chicken | 4,135 | 28 | 17 |
| Purina Pro Plan Sensitive Skin & Stomach Puppy Salmon & Rice | 3,976 | 28 | 18 |
| Taste of the Wild Ancient Prairie Roasted Bison & Venison (all life stages) | 3,920 | 32 | 18 |
The values are as fed (as the food is sold), according to the catalog entries. The table does not say which one suits your dog: that depends on size, weight and the veterinarian's guidance. To put two formulas side by side, use the dog food comparison tool.
How much should you increase food during nursing?
In nursing, the FEDIAF (2021) formula starts at 145 kcal per kg^0.75 and adds a term that grows with the number of puppies and with the week, up to a peak in the fourth. According to the Veterinary Nursing Journal, these are references: the adjustment comes from each dog's body condition and weight.
The same source describes that well-fed dogs gain 15% to 25% over their pre-breeding weight during pregnancy and 5% to 10% more after birth. This is the parameter the veterinarian uses to check that the amount is right.
Does she need calcium supplements?
In general, a complete food already covers calcium for the pregnant or nursing dog. The Merck Veterinary Manual says that calcium and phosphorus needs increase during pregnancy and nursing, and that calcium deficiency is uncommon in dogs eating complete, balanced diets.
The same page records calcium deficiency in diets rich in meat or made only of meat, which are high in phosphorus and low in calcium. The manual gives an ideal calcium:phosphorus ratio of about 1.2 to 1.4 to 1 in dogs. A supplement given on your own upsets that ratio, so the decision to give calcium is always the veterinarian's.
What not to do
- Do not increase the food from the start of pregnancy. According to the Veterinary Nursing Journal, energy only rises in the last trimester.
- Do not use a large-breed puppy food. It limits energy and calcium and does not suit a pregnant or nursing dog.
- Do not supplement calcium without guidance. It changes the ratio with phosphorus.
Frequently asked questions
Can a pregnant dog eat puppy food from the start?
According to the Veterinary Nursing Journal, in the first two trimesters the recommended food is a complete adult food. In the last one, when energy rises, the need can be met by switching to a complete growth food.
Until when does a nursing dog eat puppy food?
The source consulted does not set a date for the return to adult food. Since nursing lasts as long as the puppies suckle, the exit from growth food is arranged with the veterinarian, looking at the mother's weight and weaning.
Pregnancy calls for a good-quality adult food until the last trimester, and nursing calls for more energy than pregnancy. The right amount depends on weight, litter and veterinary guidance.
Picked by score from our overall dog ranking, not by the topic of this article. To get it right for your pet — age, weight, spayed or neutered — take the quiz and get a list made for them. A pet with a diagnosed condition needs a diet prescribed by a veterinarian.
