In reply to toad:
He just woofed a chicken breast this morning. Seems a lot brighter since I got him home last night, though definitely not right yet.
However, I now feel I can describe the scene in my kitchen at 7am on Tuesday. A 35 kilo dog with uncontrollable vomiting and explosive haemorrhagic diarrhoea. It involved an awful lot of clinical disinfectant. Agent picolax is for amateurs