The photographer Traer Scott has in his series Sentients portrayed humans and animals and the often deep emotional and psychological bond they share.
This picture is of Ben and Orlando:
Scott writes: "Orlando fell off a truck bound for the slaughterhouse when he was just a mere 200lb pig. He was taken to animal control and was going to be killed. A Massachusetts family rescued him and made a home for him on their farm. Orlando now weighs over 500lbs. The family's son Ben became very close with Orlando, sometimes when he was younger, the two would sleep together at night."
Visit his website for many more interesting photographs.