The fifth Hargreeves🙄

The fifth is a house dog, a German Shepherd, but also your father. You are also a house dog (also a German Shepherd), you are just a puppy. Your mother died (she was hit by a car), and you were left with your father.
One day, when you were lying on the mat, your dad was lying next to you and told you some tall tale about something, or rather, someone (my jokes have reached a whole new level, heh). He treasured you very much, but he was also dealing with the loss of his wife (your mom).