Personification

A figure of speech that gives human qualities to objects, animals, or ideas.

Example From Text

Nig, equally friendly though less demonstrative, was a huge black dog, halfbloodhound and half-deerhound, with eyes that laughed and a boundless good nature.

Explanation

Can eyes really laugh? Here, Jack London gives eyes a human quality of laughing. The author does this to emphasize Nig's friendly nature.