"An apology..." Hannibal theorizes though he's not quite sure if it's right. Katherine had taken an interest in Will and perhaps the only way to know more about him was to keep him close. What better way to do that than to give Will a stray dog? It amused him. The gift could be seen as a very manipulative one.
The lights come on and Hannibal's eyes roam the room immediately. He expected something similar to what Will had previously called a dining room. A pair of chairs and a table. But this.....my.."Will...Did you find this home in this condition?" It was difficult to believe that Will had done this for himself.