It turns out, we're to blame.
Whenever their shared history began, humans and dogs have grown a bond sets the pair apart.
"Dogs are unique from other mammals in their reciprocated bond with humans," Burrows says. That relationship"can be demonstrated though mutual gaze, something we do not observe between humans and other domesticated mammals such as horses or cats." In other words, dogs and humans can easily capture the other's attention — and find deep meaning — just from their facial expressions. That kind of communication across species is incredibly rare.For this new study, the researchers compared the ratio fast-twitch and slow-twitch muscle fibers in certain facial muscles. Fast-twitch muscle fibers can contract quickly, but it doesn't take long for them to grow tired. In humans, sprinters tend to have more fast-twitch muscles in their legs.
Those facial movements make adult dogs look more like puppies and resemble"an expression that humans produce when sad,""We hypothesize that dogs with expressive eyebrows had a selection advantage and that 'puppy dog eyes' are the result of selection based on humans’ preferences," they said.GET YOUR DAILY NEWS DIRECTLY IN YOUR INBOX
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