"You...used the keycard to my room..." The only person he can think of who has access to his spare key is...

Arthur stops in the middle of reaching out the pet the dog as he scrutinizes the details of its face, the way the dog cocks his head, and the peculiarly human quality of his eyes.

The result of his analysis is a long string of curses that act as ample reminder that Arthur was, in fact, a Marine once upon a time.

"Eames."