Disappearing Cereal

Every morning Alex gets a bowl of yogurt/fruit and a a bowl with cereal.  When he's done I put the left over cereal on the dining room table so he can graze when he wants.  Most mornings I'm surprised at the amount of food he consumes... and have to admit I keep putting more than I think I should because he eats it all.  This morning after breakfast we left the house.  When we came back that cereal was gone.  Which means one of my stinking dogs has been getting on table and eating Alex's cereal!!  Grrrr....