James Middleton spoke publicly about his experience of acute clinical depression last year, writing in a candid essay, "It is tricky to describe the condition. It is not merely sadness. It is an illness, a cancer of the mind." He's also spoken out about the key role his beloved dogs have played in his recovery—so it makes perfect sense that he's fronting a new documentary, "James Middleton's Super Dogs," about dogs and their positive impact on mental health.