thanks guys for the imput,I was told by a very!! knowledgeable breeder, that she has known them to sometimes die from an intestinal blockage due to eating to large a rock,I'm sure we've all gone through this worry, but I know something that will help for anybody that finds themselves in this situation, get a gallon of high quality!!! soybean oil from a feedmill etc.and a gallon of blackstrap molassis from whereever,pour as much as you can into the palm of your hand,they won't eat it any other way,keep pursueing them and asking them in a gentle! voice, very important! with newfies as I'm sure you all know!, to eat it,give them 6 handfulls of soybean oil and 3 of blackstrap molassis,I'll guarentee you they will pass anything in their stomachs within 24 hrs tops,we once save the life of a 19 yr.old, 1800 pound stud this way,it was recommended to us by a very smart vet