The second stage consists of the actual delivery of the puppies. The third stage is passing of the placenta. The afterbirth might pass with each individual puppy, usually within 15 minutes of delivery. If the mother has a few puppies in rapid succession, those placentas may come out en masse.
Comedies have also been classified in various subgenres, such as romantic comedy, crime/caper comedy, sports comedy, teen or coming-of-age comedy, social-class comedy, military comedy, fish-out-of-water comedy, and gross-out comedy.
Either way, you were probably observing comedy, which in literary terms is a genre of literature that adopts a humorous or familiar style and depicts laughable characters and situations. The comedy genre got its start (and its name) in Athens, Greece during the 5th century BC.