Hi there,
Did the vet confirm that his teeth are all ok? Dental problems will prevent rabbits from eating hay because their teeth hurt. The back molars are often the problem and can only be seen fully when the rabbit is under anesthesia.
I’ve noticed my rabbits eat more hay when it is refreshed frequently, and fluffed up in enticing piles in the litter box, vs. stuffed in hay racks. Also hand offering it and waggling it under their nose can help. So you might try giving a smaller amount that you refresh twice a day (in addition to all the other places you mentioned, those are good too!).
There are also some “hay toppers” that are dried herbs that you mix in with the hay to entice them to eat it. You can also mix his pellet ration into a pile of hay so he has to dig through the hay to get it it, and might end up eating some hay along the way.
But first confirm his teeth are in good shape! If they need a trim already, beginning to eat hay won’t fix them, but once they are trimmed a good appetite for hay should help them stay in good shape. 🙂
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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.