But for the scientific minds in the animal kingdom, this kind of sense of good emotions from us humans to from animals is called limbic resonance. Any form of interaction between sentient beings, not just humans and dogs, but other species as well will cause a chemical response akin to the type of interaction between said beings. Kindness and affection trigger Oxycontin, aggression and fear will trigger adrenaline.
Dogs Are Magical
Yes, they say cats are supernatural, but dogs are magical. Dogs have a beautiful connection between both worlds. The world of mankind and the world of the wild. They understand species like themselves and they understand the human species. They are very capable of feeling negative and positive emotions from man, dog and other animals. Your dog is a master of you. Don't understand? Well, you dog is better to understand you better than most humans do. If you spend a lot of time around your canine pal, the animal will grow and understand all your patterns such as body language, behavior and moods.
When you pet you dog, you are molding that animal and building love, trust, care and other positive feelings which will make your dog grow happy and healthier. Your dog will reciprocate those emotions by probably doing silly things to make you happy or just by being happy to see you by barking, rubbing and licking you.
Dogs are magical because even if you do not give live, they intern will try to give love to you by just being happy that you are with them. Dogs carry no hatred in heart and give without expecting anything in return. Your dog indeed is an emotional animal and does understand human emotions quite well. This makes it a good reason why all dogs must receive love.