I agree that dogs have emotions and express those emotions very well, but I think we often interpret those emotions in human terms and not in canine terms, which can have different motivators/ what triggers those emotions or just mimic the signs of human emotions, so we call it "love" . In dogs, their actions may have all behaviors of human love, but is it really love as human know it? We fall in love based on a lot of factors, looks, perosonality, interests, etc. Dogs exhibit what looks like love not because we have a great sense of humor, the color of our eyes, or that we are just a wonderful human being. Dogs exhibit the behavior that looks like because we take care of thier basic needs and then some, treats, companionship (members of the pack) and other things that are important to canines that we might not even be aware of. It's a doggy thing, not a human thing.