It is very common for dogs to display dog aggression over food it is an instinctive reaction in wild dogs to something that they feel is going to threaten their food resource.

In your dog it simply means that he has not been trained to be accustomed to people being near him or his food whilst he eats.

It is something that is easily resolved over a short period of time with a little time, care, attention and a good dog training manual to help you with the steps that you need to take.

I’ve found that making mealtimes a family time really helps for instance if you have your dog eating in the kitchen why not have his food down whilst you are preparing a meal so that there are people coming in and out of the kitchen and making noise around him whilst he eats.