Can cats be "trained"? These talented felines can navigate an agility course.

(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.

Americans own 73 million dogs and 90 million cats. Why are we so attached? Watch the full episode now.

Your pet is a member of your family, and there are things you know about your cat or dog that no one else would ever guess. Now it's time to spill!

The results are in! Check out the winners and runners-up in NATURE's Why I Love Cats and Dogs Photo Contest.

Here are some recent cat photo entries to our "Why I Love Cats and Dogs Photo Contest." We want to see pics of YOUR fair feline too! Find out how to enter.

We asked our Twitter followers to weigh in on a very important question: Cats or dogs - and why? Here's what they had to say.

You've already bragged to friends and family that your dog or cat is the cutest in the world -- now prove it! Send us your photos.

View additional resources for NATURE's "Why We Love Cats and Dogs."

Natural history filmmakers Owen Newman and Amanda Barrett spent years in Africa trailing some of the world's rarest and most secretive predatory animals.