No pain, no gain! When it comes to staying safe, Eva Mendes need look no further than her Belgian Malinois "attack dog" Hugo, who just wants to "prove his love to me." But to keep her sidekick from doing real harm to others, she makes him wear a shock collar, which she herself has tested. "I've tried it on myself, at all levels," she told David Letterman recently, adding, "It's more than a tingle. It's way more than a tingle."