As the parent of two kids with nut and other food allergies, I live in constant fear of hidden allergens in food. (I wrote in 2006 about my older son’s near-death experience from an unmarked peanut-butter cookie.) Here is good news for parents who find themselves in this situation: Food-sniffing dogs trained to protect children with food allergies. WBZ TV reports on Angel Service Dogs, a Colorado-based organization that trains dogs to sniff out the scents of dangerous foods in the same way that law enforcement dogs are trained to sniff out contraband.