
I also think that tolerance levels have decreased. If you go onto many other dog or pet forums, they will be filled with indignant posts about "ignorant owners" and "ill-mannered dogs" and stupid, irresponsible people.
I would hate to be labelled as one of those people. I mentioned on a different forum that a year or so ago - when my dog was 99% reliable with other dogs, sadly she isn't anymore - she spent much of her time off-lead. She had a good recall and wasn't aggressive (at that time), and if another walker had their dog on a lead, then I would put mine on hers. But I was blasted for being irresponsible, because she was only 99% and not 100%.
I got involved in a heated debate about the difference between people who train their dogs for competition obedience, and average family dog-owners who just wanted to walk their dogs without having to sign up a solicitor in case anything happened. A dog is a dog is a dog, right, you can't expect 100% perfection 100% of the time, otherwise none of us would ever go out for heavens sake.
I got on the wrong side of a few poeple then, I can tell you. I suggested that they were being intolerant, unreasonable "dog snobs". Anyway, the point of all this is to say that, I believe part of the reason we turn to classes and trainers is that is considered more socially acceptable to have a well-mannered, well trained dog, than to fly by the seat of your pants and hope for the best, in the knowledge that dogs are dogs, people are people, and occasionally things don't go to plan.
There is also far more media coverage about Dangerous Dogs, and more publicity about staying in control and being responsible - because if trusty Fido growls a bit when playing with a tug toy, he is only a step away from tearing a child to shreds. Hence we all need trainers.........