We took our dog to Shrewsbury.

Why? What do dogs get out of a folk festivals? Is there a dog entertainer? Or do you leave the dog on its own whilst you go to a concert or a workshop. In a tent? caravan? motorhome? Does it bark whilst you are away from it? How do you stop it barking if you do? Do you rush out of concerts to stop it? Take it into concerts? Do you take your dog everywhere you go? Do you go to the cinema? Concerts? Greengrocer? Butcher? Supermarket?

I'm pretty sure he liked it,

Anthropomorphism. You have no idea whether the dog liked it or not.

lots of tail wagging and looking pleased with himself

Good for the dog - he not do this normally then? And how does a dog show he is looking pleased with himself?

Lots and lots of people seemed happy to see him. Loads of adults stopping to say hello to him

They said "Hello?" Really? Total strangers talked to your dog and expected a reply?

hardly passing a word to me or who ever was walking him at the time

People spoke to a dog and ignored a human? Clearly we are a dog-loving nation and not a person loving nation.....

So I guess for lots of people dogs are welcome at festivals

Really? It would be possible to draw other conclusions!!

Perhaps if you find their presence so difficult you should only go to festivals where dogs are not allowed? That way you are not taking away any thing from people who do like dogs around

Perhaps if you left your dog at home those of us that are not particularly fond of dogs would not have to put up with dogs biting children. Did you not read the first post?