A variation on that second poster should be put up in all junior school classrooms!
It could pretty much apply to all animals and where it says hug,it could say hug/squeeze (some animals like a hug from familiar people but none really enjoy a squeeze!)
They are good ground rules,that children who have pets,(or come to know someone's pet well) can adjust a little,according to the particular pet,as they grow to know it's character/likes&dislikes. Those kids that are in infrequent contact with animals will benefit from the basic ground rules.
Different dogs and different kids will always react differently. Yes they have to realise respect for something that has teeth and and can do harm.
I am always respectful around a strange dog until I know it is happy for me to stroke it. Children need to learn the same.
As for babies and large dogs, that is another sad and difficult case, given the latest news.
I think there are a lot of people, adults mostly, who do not recognise dog body language accurately so how do they pass this on to their children.
How many times have we seen the words 'he turned without warning'? When there is usually a lot of warning when a dog is stressed or unhappy with a situation.
A wagging tail does not always mean a happy dog and a dog with it' ears back and its eyes bulging isn't automatically lonely or sad or in need of a pat or a cuddle.
When I was a kid I had no fear of dogs which was actually not a good thing. My mother managed to drill into me eventually to always ask permission before touching a strange dog (reinforced by a massive roasting by a police dog handler when I tried to reach out and pat his dog) never to run, never to scream (basically, don't act like prey)
A lot of the rules are the same as my dad's when we got our dog. 'DON'T PUT YER FACE NEAR HIM!' and 'LEAVE HIM ALONE WHEN HE'S IN HIS BOX' (we had a cardboard box instead of a bed as he was a JRT). He'd bite if you put your hand in anyway. Good training.
I trained my big lad to hug, where I kneel down and he rests his head on my shoulder. He will do it for a treat but generally speaking doesn't want to be touched. That's a preference though (he just looks sad, he's not nasty) and I'm an adult and I pay for his food so I get to hug him and that's just how it is. He oughtn't to be so furry if he doesn't want to be touched. The little one LOVES any kind of physical contact, and a moment without is a moment wasted.