I fail to see how this can be viewed as bad.
You didn't see that episode of charmed where that witches familiar turned evil and killed her?
But seriously, I think it can be go either way, depending on the nature of the person and the creature. The connection may be indeniably innate as it should be, but that doesn't always equate to a "good" thing, doesn't mean those two creatures will see eye to eye ... especially if both beings are of the stubborn variety.