bright green poo this morning, goodness only knows what he has eaten.
steriods were not a high dose, and already winding down, nearly at the end. He ran off again this morning.
Thing is, we are being super careful about where and how we let him off, so that he isn't a danger to others. eg when he ran across the road, we were a whole field and river away, in the woods, which he loves and doesn't want to leave. I usually don't put the lead on until half way across the field, but being cautious I went to put it on at the river and he took one look at me and put his head down and took off.
Same place today, on the way in (which is normally safe as he wants to go into the woods), waited until we were over the river and half way through the woods before I let him off the lead, and he turned right round a bush and vanished. 10 full minutes later I saw him back in the field, on the way back to me. So he had turned right, ducked down through the woods, crossed the river and gone back over the field. 
He then walked to heel very subdued, on the lead for most of the walk, while his friend ran in mad circles round him wondering why he wasn't allowed to play. There was one place I could let him off, but he had a miserable walk, and is now lying on the floor with a huge fat stomach, again goodness only knows what he has eaten.
It isn't so much that he is running AWAY, more that he is running TO food. I am guessing this morning that he smelt something as we crossed the field, and took the first chance to run round back to it.
Vet thinks his recurrent ear infection might be helped by going on an allergy free diet. I did say that until he stopped eating everything in sight, I wasn't going to pay for special food!