How do I train my dog to ignore food on the table

Practicing leave it with a treat on the floor, rewarding the dog with a different treat for looking away or backing off rather than taking the item, builds the basic skill in a low stakes setting before ever introducing the much higher temptation of unattended food on a table.

Once the dog reliably leaves a treat on the floor, practicing with food placed briefly at table height, then working up to a full meal being eaten at the table, lets the dog succeed at each easier stage before facing the harder one.

Every time the dog chooses to look away from tempting food on its own, marking that choice immediately and rewarding it well, ideally with something as good as or better than the temptation itself, reinforces the specific skill of voluntary self control around food.

Moving to a harder stage before the dog reliably succeeds at the easier one sets the training up to fail, since a dog that grabs food during an overly ambitious early attempt learns that grabbing sometimes works, which directly undermines the goal of the entire exercise. Spending several short, successful sessions at each stage, only advancing once the dog shows consistent, relaxed disengagement rather than a single lucky success, produces a far more reliable result over the following weeks than trying to move quickly through the stages in the interest of faster progress.