We think we fixed it!! We think he was getting GI Stasis. He is prone to it, because he molts so heavily. Our vet taught us how to fight it, since we lost our first buns to it. We gave him some stomach meds, lots of kale, mint, fresh pineapple, and belly rubs (those work like magic!). (He had been going to the bathroom, but I noticed right after posting this question the droppings went from normal to incredibly small and few) We just got it moving again tonight, with normal size droppings! He is a very happy, loving rabbit tonight. I’ll be keeping a close watch though.
I do wonder… He has the hardest time digesting his hair. It is thick, since he is a Rex/Dwarf mix. I use the furminator brush and it helps, but didn’t prevent him from getting sick. What does everyone else do? He gets regular greens, lots of hay, papaya vitamins, pineapple juice when he sheds, etc. He’s on Oxbow food for adults too. Would it be unkind to cut his hair short when he starts to molt, so it is easier to digest?