 Barking at Meal Time
Check out his ears! I know that sounds really weird but dogs who start to lose their hearing tend to become very vocal during random events (such as meal time)
My Shetland Sheepdog before she went deaf began to "talk" to us more in attempt to get our attention out of fear/confusion.
If the ears are okay then it is simply a bad habbit. Dogs are ALWAYS going to want more food, but don't give it to them. If I left food down all day my dogs would eat so much they'd self explode... so never let a dog's stomache be your guide.
Have him sit before getting his food, place it down, let him eat, pick it up again and make him sit again, place it down and let him finish. After meal time pick up the bowl and command/direct him out of the area laying down on his bed/crate/etc. Then correct any barking from a distance with a squirt bottle.
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dog barks after every meal?!? 
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