The worst that will happen is nothing, while in many cases you will find your dog acting more secure and confident because you have clarified and reinforced its position in the family. Obedience training is a GOOD idea. You always eat first. Have a snack or eat your meal before you feed the dog. Make sure the dog sees you eat.
Obedience training is a GOOD idea.
Do not free feed, put dog on a feeding schedule so it becomes aware that you control the food source. Dog must sit or down-stay while food is being put down or offered and must wait for permission to eat or take a treat. The same is true of toys or chews. If the dog will not wait for permission, the food or treat or toy is quietly put away to be re-offered later. The dog will figure this one out before it starves.