Owning dog protects against mental illness

DEAR DOCTORS: My wife read somewhere that when kids grow up with a do in the house, it can keep them from getting schizophrenia. I know that having a pet can help kids develop responsibility, but preventing mental illness seems like a stretch. Is this based on psychology — or something else?

DEAR READER: Your wife is referring to the results of a study published several years ago that found a link …