Tears of Freindly Dog

While dogs can feel sadness and grief, they don't actually cry in the same way humans do. In other words, their sad feelings don't prompt a flow of tears. Humans, in fact, are the only animals on the planet to shed tears as a result of their emotional state.
That’s not to say our dogs are constantly playing tricks on us; it’s just another reminder that we can never be 100 percent certain of what our dogs are feeling. Even so, we can usually decipher their messages and respond. This is the primary source of our bond with the canine species, one that’s undoubtedly emotional. We thrive in response to their joy, attention, and affection. And they thrive in ours.

We also know that dogs will make unusual and distinct vocalizations if they see their owners have been physically injured in some way. This tells us that dogs not only express strain or emotional ache, but they also have the capacity for empathy of some kind.