babyhowie,
Quinnon will learn it anyway, it is just like ---> you need to find the "switch" on his body, once you found it, and help him out, he will learn it right away.
Quinnon just has some psychological issue, he needs to figure it out, once he did, he will go to toilet for peepee and poop poop.
Give him some time, this summer still have a month to go.. keep the training process every day and don't skip a day.
Take care, and keep in touch