You will be living the life from a little dog pup all the way to death. Depending on your choices will depend what you (the dog) will become.
This story has no one good ending. It does have some bad endings but this is definitely not a linear game. This game might be short but there are lots of different options and different endings. Each ending ends with a death, but depending on the death and how you lived your life will tell you how good/bad the ending is.