Treat balls are good, though if he's anything like Little Un it could take him a long time to figure out. First he tried getting him tongue in the hole, then stamping on it & then he was running it around so fast that if any nuts did fall out he didn't notice. It took watching another horse with one to get the idea, though even now if they don't come out straight away it gets pushed too fast to be effective. That pony has no patience!
They look better than my lad's seemingly small cut that he came in with 11 days ago and so far has had two vet visits and two courses of antibiotics. I'm so pleased for you that he seems to be healing well.
Oh no!!! What did he do????