About three hours ago my full grown (100 lb, fat, lumpy) boxer ate a small ball of aluminum foil that had the scent of food on it. He ate it while we were out of the house. I'd say the ball was a little bit larger than a golf ball. He has stooled twice since the foil was eaten, and they seemed normal. He hasn't had any diarhea, hasn't thrown up, nor acted odd in any way. I was wondering if anyone knew if it is in fact harmful, or if we shold just keep an eye on him and see how he does. Please, if anyone has any knowledge about this, responde.