They were all alone, the owner is no more, mother is injured. Scientists have found that man tamed dogs in the stone age, long before domestication of other animals.
The reason for this could be omnivorous ancestors of dogs, able to eat the same food as their neighbors-people. First of all, it is necessary to allocate a special place where mom and her babies will be.
You have to equip it with everything you need to make a soft warm blanket, prepare electrical heater, it may need to warm puppies, electric scales for weighing puppies and dogs substitute milk, if milk is not enough, or the puppies will be so weak that it is not able to suck milk and have to feed them from a syringe milk replacer.