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In The Curious Incident of the Dog in the Night-time, Haddon uses symbolism to stress the importance of seemingly insignificant things in Cristopher's life, providing further explanation as to how his thought process works.
symbolism of the dog
The dogs are one of the first significant symbols in this book. At first, the dog represents a sense of security for Cristopher, because “they do not tell lies because they do not talk.” The truth is essential to Cristopher, and when the one consistent truth in his life disappears, it parallels how his perception of his family and his situation slowly uncovers itself to be a lie. The dog was a constant to him and the only genuinely trustworthy thing, and by the end everything he knew to be true was false. Towards the end, when his dad gets him a new dog, it represents how his life is starting to fall back into place again, but he’s grown into a different person and is starting new.
Borrowed from https://victoriainfinger.wordpress.com/2014/09/25/a-curious-book-title-an-upturned-poodle/