How does W. Bruce Cameron use imagery in A Dog's Purpose?

Examples of Imagery:

"Ethan and Hannah came to a halt at the bottom of the hill, tumbling out of their sled. They lay on top of each other, giggling. Todd stood and watched them. Something in Todd came to the surface, then. Not anger, exactly, but something worse, something dark, an emotion I'd never felt from anyone before. I felt it in the way he stared at Ethan and Hannah, his face very still."

"Todd didn't see me; he was watching the fire. And I never barked, I never growled, I just ran up that sidewalk in silent fury. I leaped for him as if I had been taking down men my whole life, and surging through me was a sense of power, as if I were leading a pack."