You may be reading this the same evening something happened, so here is the part that does not wait for an appointment.
Stop the rehearsals. If the fight is over chews, chews go away for now, or they happen behind a closed door. If it is the bowl, the dog eats somewhere nobody needs to walk past, and nobody walks past. If it is the couch, the couch is off limits for the moment, managed with a gate rather than a confrontation. You are not training yet. You are stopping the dog practising.
Do not test it. I know the urge: you want to see how bad it really is, so you walk up to the bowl and watch. Every test is a repetition, and if it goes wrong you have both a worse dog and possibly a bite. I will assess it, at a distance, with a plan, and it is my job to take that risk rather than yours.
If there are children in the house, separate rather than supervise. Supervision fails at the exact moment everyone is tired and someone walks through the kitchen carrying a plate. Gates, closed doors and separate rooms are not a permanent answer, but they are tonight's answer, and children are never part of the training.
Then write down what actually happened. What the item was, who approached, from where, how close, and what the dog did first. That first behavior is the one I care about most, and it is the one everybody forgets by the time I arrive.