Hello..
New to all this, but I happened to catch your post. I have German Shepherds and I feed a completely raw diet. (frozen chicken quarters and 10% organ meat) I wouldn't be too concerned with your dogs agressive reactions to the food they are consuming...un less they have a particular life experience of killing and animal -cringe- to compare it to, or associate it with, more than likely they react like this because it TASTES really good to them. You can equate it to the similar reaction when your buddy, particularly a younger dog, gets ahold of your Big Mac when you forget and leave it someplace convenient. You can bet it will be swallowed whole before you can dig it out of his mouth.