On the whole, Canadians have little to fear from the wildlife that is all around them. There are very few poisonous animals in Canada and the area they inhabit is very small. Most Canadians live in urban areas and, consequently, most schools in Canada are in urban areas where the most dangerous wildlife they might encounter would be a skunk. And the worst thing that might happen in that situation would be that the skunk would spray you with an extremely foul-smelling scent.
There are exceptions to this rule. In Banff and other prairie or northern cities or towns, people have encountered moose. Moose are generally docile, but they have been known to charge and attack humans. Cougars in the mountains of the Canadian west have caused problems as have bears and wolves across the country. But these exceptions are extremely rare and most wild animals avoid humans. The majority of Canadians will never encounter any of these animals outside of a zoo.
One problem that is serious and you should be on the lookout for in Canada is rabies. This is a disease that can affect animals like raccoons, dogs, foxes and wolves and can be passed on to humans through the animal's saliva. If an animal bites you, you should seek medical attention immediately. There are treatments for rabies and it is not fatal if treated early enough.