In reply to crustypunkuk:
The first thing I would do is take them for a long walk together just to get them used to being in each other’s company. Start off by feeding them separately with the new one locked in a separate room and eventually leave the door open then gradually move the bowls closer together. If one tries to steal the others food or push their way in, then (gently) correct the behaviour to show it isn’t allowed.
Owner of a rescue Akita (ex-yard dog and guard dog, who had some issues) and recently an Australian Shepherd companion for him, wasn’t my first choice but one who accepted him and was accepted by him, so who am I to argue?