Thank you for that information. I am sorry for the delay as I was not notified of your response.
It sounds like you have a possessive aggressive dog and if steps are not taken now it will get worse over time. Dogs see many things as a possession, from humans, to toys/bones, to space.
The best thing to do at this time is daily training in obedience and put him on the learn to earn program where nothing in life is free to him, he must earn everything he wants, including dinner.
He needs to be kept off of furniture as this is seen as a possession and there may be a little alpha aggression going on and being on furniture puts the dog at the top of the household making humans second or last. This cannot be tolerated.
I am going to direct you a training site using positive reinforcements for good behavior and you can put his normal bowl of kibble up high and use that as his reward for listening to you. He should not have a full bowl of food placed in front of him anymore.
I will also direct you to a link on the learn to earn to read through. Put these two things in place daily if you want to see a difference.
Dr sophia yin learn to earn https://drsophiayin.com/blog/entry/the-learn-to-earn-program/
Clicker training/positive method training/ print off
video’s to see how clicker training is done,(go to videos )