Puppies usually nurse on their mothers until they are 3 to 5
weeks old. Unfortunately, some dogs run out of milk for
their pups before that. Some causes of failed milk
production can be treated. However, it is easier to prevent the
mother from running out in the first place..

Symptoms
The damn is not producing milk.

Causes (1)
Failure of Milk to Let Down
Most mothers instinctively encourage their puppies
to suckle soon after delivery. Suckling stimulates the
release of oxytocin from the pituitary gland. Oxytocin
is responsible for milk letdown. A nervous,
frightened, or stressed mother may discourage her
puppies from suckling, or may release a hormone
(epinephrine) that blocks the action of oxytocin.

Treatment
Examine all the nipples to be sure they are all open,
fully formed, and erect. A deformed nipple may
cause difficulty in suckling. A recessed nipple can be
improved by massaging it to stimulate the flow of
milk and then putting a vigorous suckler directly on
that nipple.
This problem can be solved with oxytocin. It may be
necessary to repeat the oxytocin during the first 48
hours.

Causes (2)
Failure of Produce Enough Milk
True agalactia can be suspected if the female's
breasts do not develop in late pregnancy. This
condition may have a genetic basis. These puppies
must be hand fed using artificial milk.
Occasionally, a dam with a large litter is incapable of
producing enough milk to satisfy all her puppies. The
most common cause of insufficient milk production
is failure to feed the mother an adequate number of
calories, especially during the second or third weeks
after whelping, when nursing demands are the
greatest. This problem is entirely preventable.
This should be suspected if the mammary
glands are firm and swollen but no milk is found in
the teat canals.

Treatment
There is no way to make a dam produce more milk. If the mother is constitutionally unable to produce
enough milk, her puppies should be supplemented
with artificial milk.

Prevention
Feeding a pregnant dam high quality food during
pregnancy may reduce the instance of failure to
produce enough milk. High quality foods will be
locally manufactured, contain no by products, corn,
wheat, soy, "meat", or other non-beneficial
ingredients. Ideally, the food will utilize clean, human
quality foods, prepared in a sanitary facility.

I hope this is helpful to breeders

You mean meat is not good for a pregnant dog?.

Raw meat or undercooked meats can make a dog deathly ill with worms and other internal parasites...which can
cross the placenta and also infect and kill the new
born pups.