Parents should teach through communication & encouragement. Peer pressure works but that could be mean if a kid isn't taught by their parents & goes to school smelling like poop.....that peer pressure wouldn't be as kind as what parents training should be.

Back when my daughter went to pre school in thr early 1980's it was required that they be potty trained. Preschool teachers weren't paid to change diapers.

There are lots of things that good parents should have open discussions with their kids about & not just let them learn off the street. Maybe that's why so many kids struggle with so many issues?

I have actually heard of cats who have been trained to use the toilet...great idea...saves on the cost of kitty litter also.