Dogs are called mans best friend for many reasons. For hundreds of years, dogs have been friendly, loyal and protective of their human owners. For just as many years, dogs have accepted the love and affection of humans and have been greeting them with a wag of the tail all this time. A dog still wants to be your buddy and play with you even if you’re in a bad mood or haven’t spent much time with him recently. They don’t judge us for things like that, they just keep wagging.