Why do the dogs love Sarah first?

Dogs don't need to become acquainted with someone before sharing their love. Anna, Papa, and Caleb will come to love her, but at this point, they're all getting to know each other.

The dogs loved Sarah first. Lottie slept beside her bed, curled in a soft circle, and Nick leaned his face on the covers in the morning, watching for the first sign that Sarah was awake.