What a relief to know your dog is well again.
Whilst caravanning in Yorks a couple of years ago, our 12-month old GSD was suddenly pole-axed with something similar and we nearly lost him. The vet kept asking for reassurance that he'd been vaccinated, and we were told to prepare ourselves for the worst. He was isolated at the vet's for 10 days, with 5 of them on a drip, tons of other treatment too - the invoice filled 2 pages of A4. The vet remarked that they'd tried all sorts, but nothing was really working, so all they could do was support the him and hope that his own will to live would get him thro. They asked us to visit whenever we could, to keep his spirits up. That was gruesome, because he was losing so much blood and became so thin and weak. When he was finally well enough to come back to us, we were told that his intestine was so damaged that he might have food intolerances for the rest of his life, but I'm pleased to say that hasn't happened.
The vet treating him was new to the practice, and apparently he was a bit wary of German Shepherds, so our lasting memory is of his beaming face when our poor skinny dog jumped up on his hind legs to say goodbye when he left!
I should also say that the Wardens at the site in Yorks were great, as we had to reschedule our other bookings and stay put there for longer than expected. It was not one of our more relaxing holidays, especially as we had other dogs and the cat with us, and were holding our breath in case they went down with the bug too.
I saw in one of your other posts that you'd encountered a multiple collie owner. We have an acquaintance, also 'expert' to the point of competing at Crufts with her collies, but she's negligent in the poop-scooping department too. She told me this week that her dogs had a bug that was so bad that she'd needed help from the vet, and apparently there was something doing the rounds (er, hardly surprising when you don't pick up the poo?). In the next breath she told me she was off to a competition up north - a chance to spread the bug further still? I feel quite negligent for not challenging her about it, but where do you start? I would hate to see her back garden. Yuk!
At Crufts they have a real problem with owners not picking up after their dogs too, in spite of the place having loads of bins. By the end of the 4 days, we found the road between the halls and the car park was like a minefield and the stench of urine in the underpass was breathtaking. Wonder how much the cleaners get paid for disposing of that lot. As you did with the collies, we sometimes find ourselves picking up 'stray' poo when caravanning, in case anyone should think it's from our dogs.
This post has got rather long. Can you tell it's one of my specialist subjects