Yes. It is always best for the puppies to receive the mother's milk. Colostrum is the first milk that the mother dog produces, which is necessary for the puppies to receive within the first 24 hours of life, so that they receive natural bacteria in their guts, and receive the mother's antibodies. If the mother is incapable of giving milk to the puppies, if the puppies were found without their mother, or the mother has died, you can get milk supplement in the form of a powder from a pet store. It works much the same as human milk formulas, and comes with directions for how often they should be given it.