Right-Wing & Right Minded

I NEED YOUR HELP
I need some help from those of you with dogs. I have a dog that, for some reason, just refuses to eat sometimes. But it's not that he doesn't eat at all, it sporadic. For maybe two days he'll eat every bit of food I put down as soon as I put it down. And then he'll go into a pattern of eating nothing for two or three days. Sometimes he'll just smell it and walk away and other times he won't even bother getting up. Does anyone have any ways you use to get your dogs to eat. Forget about getting him a different brand of food, he'll only eat one brand. I've moved his dish to a different spot. He's not gotten sick yet, but one day he might.
The Only Thing Necessary For Evil To Triumph, Is For Good Men To Do Nothing