Question: do mom dogs get sad when puppies leave?
Answer: The newly adopted puppies are more likely to be lonely. But will probably miss it's litter-mates as much, if not more than it's mother (as long as it is 7 or 8 weeks old). ... I've had dogs that had puppies and could wait until they were weaned and gone, except once. Papa had a litter of beautiful mix breed puppies.