Well 24 hours and a bit later, he seems almost back to normal. He's favouring it ever so slightly but that's it. And he's going crazy because he's not been for his walk. I gave him lunch in kongs and have been playing training games with him, but I fear he's going to be bouncing of the walls by this evening.
Think he was lucky. My husband said the noise he made when he hurt it was horrific and he was convinced it was badly broken. I've told Ziggy he's clearly a boy dog and needs to man up!!