I would not allow an animal that I had raised to exhibit such behaviour but, really, what is the big deal?
This is an adult dog in a new home that is very different from the environment it was raised in and it is showing a very natural behaviour. By taking this head on you run the risk of making a natural behaviour an issue, being the cause of aggression and forcing the dog to bite. Surely it is saner to feed the dog in peace, understand the reasons for its behaviour and take away the risks of an otherwise safe and happy animal becoming a problem and a danger?