Source: ShutterstockThe nature of investing is that you win some, and you lose some. And there's no doubt that Petco Health and Wellness Company, Inc. ( $Petco Health and Wellness Company, Inc.(WOOF)$ ) stock has had a really bad year. The share price is down a hefty 50% in that time. Because Petco Health and Wellness Company hasn't been listed for many years, the market is still learning about how the business performs. The falls have accelerated recently, with the share price down 18% in the last three months.While the last year has been tough for Petco Health and Wellness Company shareholders, this past week has shown signs of promise. So let's look at the longer term fundamentals and see if they've been the driver of the negative returns.There