I thought you were saying he had diarrhea--that's why I said hay only. You mentioned a messy bottom. Sounds like it was some gas, glad everything's good now!
Ah. I think it was more like he wasn't moving when he pooped so some well-formed hard poops ended up glued to his bum.
I took your advice and only gave him hay, but the poor little guy was instantly STARVING and he got so upset seeing the guys next door chowing down, he got his allotment of pellets. Not veggies though. He certainly wasn't happy about that!
I'll let him know he's cleared for veggies, he'll be very pleased! (But I'm going to be examining every last leaf for spoilage).