What would your dog do if you fainted?

NEW YORK, NY (CNN) - Man's best friend came out looking more like a passing acquaintance in unscientific experiments testing what a dog would do if its owner collapsed.

Most dog owners were doggone disappointed. But it turns out there may be a good reason that so many dogs left their master in the lurch.

Japanese pet owners posted videos online of their dog's reaction to them fainting and the results had many owners feeling abandoned.

Human? What human?

Every once in a while a dog would give a glance back, but they tended to keep going. Sure there were a couple of dogs who lived up to that man's best friend stuff. On the other hand, there was the one that used its master's fall to escape. Whatever happened to good old Lassie? When Timmy fainted. Lassie not only pulled him out of the water, she went running for help.

The closest thing to Lassie in the Japanese videos was a bird that refused to leave its owner.

Dog defenders argued that canines are too smart to fool.

"They can smell your vital signs," one person said.

Animal behavior expert Bash Dibra agreed.

"Totally. There've been proven facts that the dog can smell and connect with a person when they're in dire need," Dibra said. "But if you're not, if you're playing games ... they're going, 'OK, this is not what's really happening.' So they just walk away."

Tell that to CNN makeup artist Yoko Fumoto and her Sheltie Lance. When Yoko fake fainted, Lance seemed blissfully unaware as he paraded off munch on grass in Central Park. Leaving his mistress to contemplate being abandoned, lanced through the heart.

Yoko said she was initially disappointed.

But hey, they can't all be Lassie.

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