There's something most investors have in common with their game-changing winners: They got in early. That doesn't mean you have to find the next Microsoft or Apple as they go public, but you do have to be diligent about finding stocks with long-term upside early in the game. Here are two stocks that fit the bill and might be investments investors can't afford to overlook. Whether younger people are increasingly opting for pets and delaying parenthood or older generations are filling a quiet household with a new furry friend, Americans are clearly devoting more time and money to their animal companions.