Don't worry, he's not injured! I popped the vets tonight and was chatting to one of the nurses and she told me about Harry's rather extreme reaction when the put the cone of shame of him when he broke his jaw.
Now I knew he protested, but not how much. Apparently he went mad and was practically flipping over. The nurse and the vet were watching him, trying to work out how to get it off him without being shredded or losing a limb when he finally ripped it off himself, calmed down and went to sleep!
As well as 'do not administer ketamine' I think he needs 'do not fit buster collar'!
He's so determined and so strong!