that has nothing to do with being reproductively whole.
don't try to pet him, change him , correct him.
some dogs bark at their food --- give it the old one , two .
How do you effectively correct a dog that is growling, barking, and showing it's teeth? They say not to yell at them. Then 5 minutes after laying down after the incident, he comes up to you wagging his tail and wanting you to pet him. It's definitely not him just barking at his food. I was hesitant to give that example because of that, but I did because it happened just this evening.