laws on killing animals for self defense in canada?

What are you on about - self defence laws are usually similar all around the world ???? - i don't think the laws would be different in Canada ???? in a kill or be killed situation - whether it's against someone else or a animal that's gone wild

As long as you say "Hey Ned! It's coming right for us" before you shoot, you should be OK.

https://www.youtube.com/watch?v=Nt6kKhlX8vU

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THis should help:
https://www.ontario.ca/page/harass-capture-or-kill-wild-animal-damaging-private-property