Dog People vs. Cat People: What Pet Preference Says About You

"Some guys like to hang out with the guys and then there are the guys that are the loners, you know," Bob Stephanos said. "I bet you the loners are going to be cat guys."

But a quick look of famous pet-owners shows a lot of cat-loving macho men. Ernest Hemingway had a six-toed cat named Snowball. Winston Churchill's cat Jock was one of his favorite pets, often sitting on his knee. Bill Clinton brought his adopted stray cat Socks with him when he moved to the White House in 1992. And in the movies, there's Don Corleone and Dr. Evil.

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But for even more support, there's Jackson Galaxy, a 6-foot-2, 275-pound tattooed, guitar-playing dude with a weakness for cats.

Jackson said that cats are the perfectly designed killing machine. Recognizing cats as one of nature's perfect predators is key, and caters to the masculine.

Jackson loves cats so much that he became a professional cat behaviorist. He now stars on the Animal Planet show "My Cat From Hell," where he transforms demonic felines into purring lap cats.

So, is it possible to love both cats and dogs? The obvious answer is -- yes, of course it's possible -- and it even has a name.

"We have to stop this ridiculousness of classifying ourselves," said Jackson, who has a dog in addition to his three cats. "I'm a cat guy, I'm a dog guy. I'm 'bi-petual.'"

Watch the full story on "Pet Crazy" on "20/20" tonight at 10 ET.