It's an interesting idea @Itsadogsworld
I haven't read anymore into your OP than follow what you suggested
I don't think teachers should be expected to teach dog safety or exposure, they've enough your teach & many may not have dogs.
You mean Something like a dogs trust doing a session on how to approach dogs safely, being invited into a school
The thing is it's have to be early years say Year R to catch the children that run up to dogs. By time DCs are older or at secondary school most children don't. It's usually younger preschool children who are full on pull /push the dog as a "cute fluffy toy "
I'm not sure that a session would stick enough when they are young nor catch child early enough - so it seems the parents would be best placed to do the teaching at home
As usually parent is with the child (not supervising well) when child approaches dog = it sounds like parent + small child need to learn , makes more sense for target audience for dogs trust offering sessions direct to parents and child in early years. I can see why you think school has wider audience and would catch everyone but, it'd be too late and missing the parents out.
Some children are allergic, asthmatic or have eczema so some parents would decline permission just incase for a session at school. I'd self select my DCs out as a. Two are scared of dogs due to bad experiences from great grandads dog that he can't control. b. having spent pre school years getting on top of childhood eczema (more common than you think) & allergies , I wouldn't want exposure at school to fur and pet dander and would be annoyed.
Thinking it through logically , it'd have low chance of achieving what was wanted