Sophie tackles the question of why there are so many different breeds of dogs. She briefly discusses the history of dogs and discusses how genetics makes dogs different and why some breeds are better suited for certain functions.
Charlotte's babies are born in the barn, and they float away, to Wilbur's dismay, in a process called ballooning. The spiderlings tell Wilbur that they are using the breeze to fly away. This ballooning process is important because it reduces competition between siblings and allows for genetic diversity.