
Hi, how old are the puppies? The bitch won't start getting her milk in fully until about day 3 or 4, and the more the pups suck, the more she'll produce as long as she is getting plenty of food and plenty to drink herself. Human baby milk isn't really suitable as it is designed to be similar to human milk, not bitch's milk. Cows milk is even worse. Most pet shops will sell "Lactol" or "Welpi" which are good substitutes, but if the pups are very young (a day or two) they will need replacement colostrum, which your vet may be able to provide. Otherwise, someone who has handreared pups will know. If at all possible get the pups suckling as much as you can - 9 puppies is an average sized litter for a lab so in theory she should be able to feed the all okay. Good luck.
:)