We had one on our property a few months ago--at least we had several deposits of cougar poop. I fired up the chainsaw and brush cutter to cut out all the brush--cover and habitat for the cougar and it's prey--and I think the activity scared it off.
At that time someone sent me a list of cougar attacks. One happened on Vancouver Island at Kyuquot, it attacked and killed a 7 year old boy in a school yard with other kids around. Here's a portion of the list:
Mountain Lion Attacks from 1991 to 2000
Lastly, I thought Canadians couldn't own pistols. Obviously wrong.