Hi Doug,
Welcome to the cheese forums!
I also live in Ontario (Caledon), and am a raw milk user from my own family cow...
My general rule of thumb, because I give some away to friends and family and want to be safe, is to gently pasteurize the raw milk for any cheese or milk products that does not get aged more than 80 days. That is the time, by general consensus, that it takes milk born pathogens to dissipate.
There also is a school of thought that says "if you want the introduced cheese bacteria to behave as advertised, give the flavour profile as advertised, and give a cheese character that is as accurate as possible to the recipe being followed, then gently pasteurize the milk" .... do I do that? ...no...
what may be more important is to respect the fat (cream) content of some recipes... e.g. Most hard cheeses aged for over 8 months want a lower fat milk... buy a milk separator, it will pay for itself quickly
Nobody has been made sick from modern healthy cow milk collection, following good milk handling practices, for a long long time... you could get away with never pasteurizing your milk... your choice, make a good decision. PS... careful with young children and raw milk... I've been told they don't have the defense against pathogens like an adult.
Hope that helps, where abouts in Ontario are you?
F