"When a person has an operation it has a picture in its head of the hurt carrying on for months and months. And it has a picture of all the stitches in it's leg and the broken bone and the pins a d even if it sees a bus it has to catch it doesn't run because it has a picture in its head of the bones crunching together and the stitches breaking and even more pain." - The curious incident of the dog in the night time.