"Phil, op has had dog for ten plus years so I would have thought she would recognise signs of stress etc, if there were any."
Not necessarily. Understanding canine behaviour is something that has to be learned, it's a skill not instinctive (unless the dog is being very obvious of course). And I do think perhaps (and I realise this is a massive generalisation) that many people who own "toy" dogs are not so motivated to learn this stuff because the dog is small enough to be physically controlled. Or they think of it like a baby not a dog!
"No, I would hazard a guess that most dog owners don't recognise a dog's stress signals, unfortunately. If you google cute pictures of dogs and babies, in most of the pictures the dog is looking uncomfortable."
^ This.
Oh god, Phil that poor dog in the first picture looks unhappy about what that baby's doing. It's not cute at all is it yet, as you say, there are plenty of pictures online like this. As for people letting their kids ride all over the dog...sheesh! And these idiots come out with stuff like "oh the dog's so good with the kids. They can do anything to him, pull his ears, pull his tail, pinch his skin, and he never complains". Arseholes! It's just as well most dogs have long fuses and are so forgiving.
"In this situation the dog owner is being irresponsible and if the dog bit that child it would be the owners fault but the dog that would suffer in the end. So sad because it is unavoidable."
I agree Iam if the dog bit the baby it would be the owner's fault, yet earlier you said if a dog bites it should be PTS. In every case?
"She never gets walked and stands in her own shit and is never walked."
The RSPCA are often useless but I'd still be inclined to report her. That dog must be going stir crazy!