Bring all dogs into the house, spay and neuter. Give or sell the puppies with spay/neuter contracts, as well as a return contract if they can't keep the puppy or dog, no matter what age it is. You are really supposed to wait till they are 8 weeks old, but as long as they are eating regular puppy food they will be fine. 8-12 weeks... 6 weeks is fine as long as they are eating dog food and drinking water consistently.