Science explains the mechanics of canine communication and behavior

Scientific research has identified the biological and neurological mechanisms behind common canine behaviors, such as the ‘puppy dog eyes’ look and head tilting.

Evolutionary changes during domestication have provided dogs with a specific muscle, the levator anguli oculi medialis (LAOM), which allows them to raise their inner eyebrows. This creates an expression that mimics human infant features, triggering a caregiving instinct in people. Furthermore, prolonged eye contact between humans and dogs has been shown to increase oxytocin levels in both species, strengthening social bonds.

Regarding head tilting, studies suggest the gesture is linked to cognitive processing. Research published in Current Biology indicates that dogs process human language using different brain hemispheres: the left for meaningful words and the right for emotional tone. A study from Eötvös Loránd University found that ‘Gifted Word Learners’—dogs with high linguistic aptitude—tilted their heads more frequently when hearing the names of specific toys, suggesting the movement is a sign of active information processing.