 We know how unlikely it is that we personally share a home with the most amazing animal in history. But when we assure our canine companions that they are the best doggy ever, we mean it. We believe this despite dealing with their barking, their personality quirks, their occasional health challenges, and the fact that because of them, we can't have nice things. Their flaw is that they don't live forever. But now some entrepreneurs are offering what sounds like the next best thing.