Have you ever heard a dog sigh? Like when you come home, and he realizes he has to drag himself up off the floor; to pull himself away from his busy, hectic schedule of lounging around the house; just to saunter to the door and acknowledge your entrance. And you can hear him give a noticeable, breathy sigh of irritation as he does it.
Or when you give your dog a command, like 'come', and he decides to stretch for several minutes, yawn, and look around for something more interesting to do; before sighing in disappointment when he realizes that inevitably he'll have to give in and obey after all.
Or even a sigh of contentment when he's found the perfect spot on the floor with optimal coolness, comfort, and stretching room. And he has managed to contort his body into just the right position to take advantage of all of those factors. And he lets out a sigh of satisfaction before dozing off into slumber.
How could anyone not be a dog person?