Have you tried VERY slowly doing a gradual change back to his regular food? Over even a few weeks just add like one or two kibble at a time so he can adjust to the switch. Hot dogs probably aren't the best thing to offer to a sensitive puppy who's been on a bland diet. Little too much too fast. Doing the extremely gradual change back to his regular puppy food may be all that needs. But again it could take weeks. Or maybe try doing a completely different puppy food for your gradual change. Just make sure nothing with a bunch of good color and crap like that. My pup is on large breed science diet and doing well on that. Also I agree that keeping your growing large breed on chicken and rice isn't probably the best for his development.
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