Poor Graham. You've gotten great advice from others, I don't know what to say. All I can add is giving him fun one-on-one time with you as often as possible! Take him somewhere that he loves where he can run off-leash with you and play. At the same time, babying him too much may be sending the wrong message. Keep up with his Obedience and maybe NILIF, and balance the affection with exercise & discipline.

What raw meats have you tried? My pups would never resist pork ribs! Have you tried satin balls, also a much-loved meal?