Who killed Wellington?

    A garden fork plunged into the dead dog at 7 past midnight, a "mystery" suspect and 15 year old autistic Christopher left to discover who killed him. Christopher is determined to reveal the secrets within the neighborhood, but what he doesn't know is that his father, Mr. Boon is the one behind the killing of Wellington the Dog.

    Throughout the Story Mr. Boon tells Christopher to stop trying to solve the murder in many different ways. Mr. Boon first warns him after Christopher is kept at the Police station for assaulting a police officer, and first warns Christopher by saying "Just try and keep your nose out of other people's business." on pg 14. Christopher attempts to explain himself but Mr.Boon replies "Leave it." in a rather stern tone, the second time Mr. Boon warns his son is on pg 32 when he specifically tells Christopher what he cannot do, he specifically says;
"OK, Christopher. I am going to say this for the last and final time. I will not tell you again. Look at me when I am talking to you, for God's sake. Look at me. You are not to go asking Mrs. Shears about who killed that bloody dog. You are not trespassing in other people's gardens. You are to stop this ridiculous bloody detective game right now" 
The Hounds of Baskerville is referenced to the readers for a reason, and this is so we get an Idea of what we are looking for and what is and can be false information. The connection happening in the book between Christopher and his dad is like the Reference to clue #2 of Hounds of Baskerville on pg 47, where Stapleton tells Watson to stay out of the Grimpen Mire because he is hiding something and doesn't want anyone to find it. In this case the situation is that Mr. Boon doesn't want his son to discover he is the one who killed the dog, Wellington.

   In the story, as shown on pg 32; Christopher brought it to the readers attention that Mr. Shears and Mrs. Shears had split up quite a while ago and he becomes Christopher's prime suspect. He tells his dad that someone could have killed Wellington to make Mrs. Shears sad, and that a crime is often committed by someone known. This now gives the Mr. Shears a motive, he could have also had easy access to the shed where the tools are. However this is a red herring because it draws attention away from the fact that Mr. Boon killed wellington, the book is focused on proving Mr. Shears is the killer, and like the second clue for Red Herrings involved in the Hounds of Baskerville shown on pg 47 they suspect the wrong person  to be a murderer because of the fact that he did a wrong, like kill someone and escape jail. In this case Mr. Shears is a prime suspect because him leaving shows something happening between him and Mrs. Shears. This also gives him motive.

 However  recently the readers  found out on page 39 from Ms. Alexander the Old lady that lives in unit 39; that Mr. Shears had cheated on Mrs. Shears with Christopher's mother. This now flips the script and also proves that Mr. Shears is not the killer, and this gives Mr. Boon a motive to kill. Some clues that Mr. Boon is in fact the one who killed Wellington is the fact that as seen on pg 32 Christopher says that crime is often committed by someone known, when they say this they mean a character that has already been introduced to the readers. This is something very common in Sherlock Holmes, an example is meeting Stapleton but thinking that the culprit is several different people before the actual reveal; Mr. Boon has been already introduced.The affair also gives Mr. Boon a motive to kill, it would make sense that he kills something that was so close to the man who his wife cheated with. Mr. Boon also is portrayed as an easily irritated or short tempered character, and also mentions that he drinks, this combination does not go well with a dog, and one that could have been very loud. The dog had also been killed at 12:07am quite late but no one knows for sure where Mr. Boon had been, because Christopher had been in his room most of the night. Mr. Boons Occupation requires a lot of emergencies during the night because he does boiling systems and plumbing, so Mr. Boon had definitely been up. Lastly weapon, how did he get the garden fork? Earlier on pg 19 they mention Mrs. Shears putting Mr. Boons head on her bosoms, this could be misinterpreted but most importantly this shows that Mrs. Shears is a very kind person. On pg 19 of the book Christopher talks about Mrs. Shears coming over to comfort them and make dinner, she seems like a very generous neighbor and lending garden tools would be no big deal to her.

  Out of all the Characters in the book, Mr. Boon the single father of 15 year old autistic Christopher is the one who had killed Wellington the dog. No one has suspected Mr. Boon but what should be done now is at least for him to tell the complete and total truth to Christopher, and Mrs. Shears on what had happened, because there may not have been a lot to prevent Mr. Boon from committing the crime. Especially, if it was late and he came back from work and decided to have a drink, the dog could have got on his temper.