It's not every day that you see high-profile morning show hosts eat dog food on air. But Kathie Lee Gifford crossed that frontier on Friday's "Today" show.To be fair to her, the dog food in question had been advertised as edible for humans. But Kathie Lee was the only person in the entire studio willing to try the food.Hoda Kotb, quite reasonably, refused, saying, "I don't eat dog food." The show's crew wouldn't touch it either.