maconfidence, withoff depend in color. now available in gray. looks and fits like underwear.otection. depend. good morning. great day. >>> there's fear of heights, there's fear of flying. there's fear of water, fear of the dark. personally? i'm afraid of snakes, which makes good sense, of course. but puppies? no way. but for some, yes way. here's abc's t.j. winick. >> reporter: marvin cruz is a mountain of a man. with a secret just as big. >> oh, hell [ bleep ] no. >> reporter: he's terrified of pit bulls. >> i'm a coward. >> you're not a coward. >> reporter: terrified. the scene where marvin breaks down and somebodies at just the sight of this puppy has gone viral on youtube. >> there were probably three days worth of comments. a lot of them were just insulting. how can a big guy cry over a little puppy. but they don't know what i went through. >> reporter: it's a real anxiety disorder that affects millions of americans. most common animal phobia? insects. snakes. >> oh, okay. >> reporter: and cats. they're all fair game on "my extreme animal phobia," a new animal planet rea