Justice will be served
Even though everything seems to be okay for now, Hayden had not forgotten what happened to her dog. She wants justice to be served and still checks up on the case against her old neighbor from time to time. So far, no further evidence has appeared that can pin him for the shooting.
But he had sold his house and new people have moved in. A normal family that Noah and Jackson can play with because they also have children. As much as Hayden would like to have justice, it just seems like it will never happen. Unfortunately, she will have to move on and let it go.