Tetra Images/Jessica Peterson/GettyThere is truly nothing better than looking down at your four-legged best friend, asking them how their day was, and getting that oh-so-irresistibly-cute head tilt as if they are giving you a direct reply in the form of a shot of serotonin to the soul. If the head tilt has you just as enraptured as the rest of us, you may find yourself wondering why it is that your dog does that, if they’re truly comprehending you, or if your dog is trying to communicate something more than “I love you” with the gesture.Dr. Megan Petroff, a residency-trained behavior veterinar...