I think he doesn't like cats.

Sunday morning conversation with Evelyn:

E: "Mama, cats are very good."
Me: "Yeah, most cats are really good."
E: "So why doesn't Barack Obama have any cats?"
Me: "Well, he has two dogs..."
E: "I think he doesn't like cats."
Me: "Maybe he likes cats, but he just hasn't gotten one yet."
E: "Yeah, he should really have a cat."