Thanks Penny.
My main hesitancy about changing vets is that a) he is a client of mine - I designed his website and he has been back for quite a few print jobs etc so I dont want to lose the work
and b) his kids go to school with mine, so I see his wife everyday.
While he mentioned rage in his diagnosis he wasnt saying thats definitely what it was - but the fact that he even considered it tells me he is already biased. He was totally convinced that it was a dominance issue, because Alfie was growling at him when he looked him straight in the eye (I recognised that as fear agression, not dominance!)
Alfie is blooming growly, but he doesnt try to dominate anyone in the house - he gets off the sofa when asked, doesnt guard food, and even the kids can send him to his bed with no fuss, and whenever Purdey challenges him for a bed or treat, he growls but gives up usually. The Alfie we saw this week was a different dog entirely, and I dont believe a dog could develop such a different personality overnight without there being a medical reason for it (especially as he has been back to normal today!).