Dog is man's best friend, but the opposite isn't always true. There will always be cruel or careless owners that will abandon or mistreat their pets. The lucky ones - if any of these unfornate pups can be called lucky - will find some other loving owner that will nurse them back to health.
This is just what happened to Luna the husky. When she was found, she was so skinny you could see her bones. She was also quite hairless from mange. However, one kind Imgur user nursed Luna back to health and now she's a much happier (and fluffier) dog!