The love hormone that drives us, also drives dogs too
Dogs have the same hormones and chemical changes that occur during an emotional state, as well do. These hormones include oxytocin, which is a love/affection/warm feeling chemical. According to a Japanese study, when dogs and humans gazed at each other, there were increased levels of the chemical, not unlike the process of a mother-child bond.
So when someone refers to their doggo as a fur-baby, it’s true. They are like children to us, because that’s how they perceive us.