I'm sorry to hear about Jezter. Does he have a fever? Have you looked at his gums?are they pale? How about his eyes? Are they glazed over? You are usually the best judge of your own dog, it you feel something is wrong, it may be as you know him best. How is his stool? Is he having diarrhea? Have you tried taking him for an extended walk or letting him outside with you for an extended time? I know this sounds silly and gross but sometimes, I think if my Dog Duncan has to go #2 he won't eat anymore until he goes. I'll take him for extra long walks and sometimes he will go a few times, come home and eat right away. Dogs in the wild are always a little bit hungry I have heard and that is the natural state of wolves. I think humans may overfeed sometimes and the dog may feel a little ill because of it. I assume you feed him at specific mealtimes, not leave food out all the time. Try leaving the food for 10 minutes, if he doesn't eat take it away. Try this today. Or trying mixing in some wet food with his dry food (if that is what he is eating). If he still doesn't eat, I think you will need to take him to the vet. Perhaps they can set up a payment plan for you. Does Jezter have all his shots?
Good luck to you,keep us posted. Sorry I couldn't help more.