(Airs Sunday, May 23) Are you cat-crazy or a dog die-hard? Watch as NATURE shares the stories of pet owners and their beloved animals.

The two-part special "Dogs That Changed the World" tells the epic story of the wolf's evolution, how "man's best friend" changed human society and how we in turn have radically transformed dogs.

When Hurricane Katrina struck New Orleans, more than 250,000 pets were left stranded by the storm's destruction.

NATURE investigates the sometimes exasperating efforts of people and wild animals to adapt to each other when their worlds collide.

An incisive look at the breeding, behavior, and training of humankind's best friend, including useful pointers on how to avoid mistakes when selecting a puppy.

Both humans and animals seem to be hard-wired to find youngsters adorable. Baby Tales explores the reasons why the young play on our heart strings.

Ironically, the powerful, dedicated canines profiled in Sled Dogs: An Alaskan Epic are little more than mutts. They are mixed-breed huskies that have endurance.

Dogs are anything but common animals. They develop lifelong bonds with the people. They instinctively know when a human or animal companion is in need of help.