I actually see him being hungrier as an improvement, because I think buns should pretty much always act starving! He’s probably thinking, “umm excuse me… aren’t you forgetting something??”
My vet has also said that buns don’t need pellets, so since he’s had some issues lately and you give him a good variety of greens, I would give it a shot for a little while and see how he does.
I don’t think you’ll want to increase his greens, he should be satisfying his hunger with more hay. If you are concerned about his weight, you could start weighing him regularly just to make sure he doesn’t drop a lot of weight too quickly.
To see if it’s really the pellets causing the issue, I think it would make sense to not give any pellets for a few weeks, then if you want to try giving a bit again you will be able to tell if he reacts poorly to them.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.