Today Felix was tied in his stall. Surprise, he was actually quite good. Hit the end of the lead, and you could see his little mind going "oh" and he stood. He still likes to swing his bum back and forth, so I have to be careful about that - I don't entirely trust him not to kick yet either, so for now he's just getting normal grooming and no walking behind him.
On another note, the vet will be out tomorrow for his procedure. Because he's a little older, I'm a bit worried about him - but it needs to be done.