Neighbour questioned
While the police were still investigating and asking questions, the neighbor still refused to admit that he was the one who shot Jackson. He denied it and was just taken to prison for the other things that they found in his house. They were unable to prove anything else relating to the dog.
Due to his denial, it always left a big question mark in the mind of Hayden who really just wanted to know the truth. It bothered her because she will never be able to put to rest who shot Jackson and that will always be in the back of her mind each time she goes outside.