It's not so easy to talk about love in The Curious Incident of the Dog in the Night-Time, mostly because its narrator really doesn't understand the concept the way most people do. He has defined a list of behaviors associated with love, so theoretically he can recognize it when he sees it. But this approach really can't come close to truly understanding what love is, and the intangibles of it – the things we simply can't name. So, love in this book is very one-sided: Christopher's parents love their son, but can't expect that love to be returned. If Christopher does love them, it's surely something very different from what they feel. There are also a few examples of unrequited love among the adults, but we're not even going to go there. We're way more interested in Christopher's strong feelings for animals – when he kneels on the ground to hug a bloody dead dog, he can't possibly expect his love to be returned in kind.