Shannon, one of the bosses, blows kisses that turn you into a chihuahua temporarily.
Roughly around 0:55, almost does it at 3:25, then does it around 3:41 and 4:23
By the way, on a personal note, anyone who is a fan of action games who owns a PS3 should buy this game on the playstation network. They currently have it on sale for $9.99 and it's a freaking fantastic game. Also, I hear from a friend that supposedly, if they get enough online sales, they'll make a sequel 8D