I'll admit that among the five human members of my family, good will doesn't necessarily abound 24/7. Harmony does happen, it's not a constant atmosphere of discontent by any means. But there is one member of our household whom everyone adores at all times, even when he misbehaves (well, eats someone's sandwich left in a spot conveniently placed for easy access by....him).
Yes, Comet the dog, is a reliable source of happiness and companionship- maybe because he's always excited to see whoever walks through the door, is always interested in a belly rub or a scratch behind his ears and finds each of us fascinating, no matter what mundane chore requires our attention. (Okay, he's not really fond of the vacuum cleaner or lawn mower, if truth be told.)
And parentally speaking, it's also nice to have one household member who doesn't require a cell phone plan!