The curious incident of the dog in the nighttime 1

From what I read so far, I notice that Christopher has a big heart and is often misunderstood as being a sly and sarcastic kid by opposing forces around him, (other than his father), but in reality, he's just doesn't comprehend human interaction and has a social awkwardness to him. I also predict that Mrs. Shears murdered the dog because she refuses to let him investigate the situation any further when he asks her, and she doesn't seem to phased by the fact that the dog is dead, days later.