Sad eyes can mean a lot of things. Although it's possible that the dog is sad, behaviorists believe dogs developed that puppy dog look to mimic the same feelings we have when we look at human babies.

Is your dog trying to tell you something? Our canine friends have their own way of defusing potentially threatening ...

A previous study by the same researchers hypothesized that "dogs with expressive eyebrows had a selection advantage and that 'puppy dog eyes' are the result of selection based on humans ...

Dogs and humans co-evolved. No other species is so closely adapted to living with us. Dogs even have special facial muscles ...

Your dog tilts its head when you cry, paces when you’re stressed, and somehow appears at your side during your worst moments.

A study finds that humans are contributors to those irresistibly sweet peepers — in fact, we bred those doleful eyes into today's domesticated dogs starting some 33,000 years ago.

A previous study by the same researchers hypothesized that "dogs with expressive eyebrows had a selection advantage and that 'puppy dog eyes' are the result of selection based on humans ...