In Robin McKinley's "Deerskin," the author contrasts the nature of love between dogs and humans. A dog's love is simple and unwavering, much like the constants of nature, such as sunlight and mountains. This reflects the purity and straightforwardness of a dog's affection, which remains true and unconditional without doubt or reconsideration.

On the other hand, human emotions are more complex, filled with layers of understanding and introspection. Humans tend to analyze their feelings, seeing both the light and shadows in relationships. This complexity explains the bond between dogs and people; dogs offer a clear, uncomplicated love while humans navigate a more intricate emotional landscape.