No poisonous snakes or spiders in Northern Canada. Winters are too cold. Mosquitoes and blackflies in the spring will chew on you, but infections are rare. Ticks can carry Lyme disease. Nasty, but curable. About the only things that can hurt you in the wilderness, besides the cold, are moose and bears. I have seen many bears up close; they run away almost as fast as I do in the opposite direction. Moose are unpredictable. They stomp things they don't like. They weigh between 800-1200lbs., and dwarf a horse. People are killed every year by hitting moose on the road. Their legs are so long, the car/truck takes their legs out from under them, then the body comes through the windscreen into the cab, all 1000 lbs of it. Usually fatal to the occupants of the car/truck ( and the moose).
Here's a funny (true) story.
A trapper friend rounded a corner on a bush road during winter on his trap line. There was a moose standing on the road. He hit the brakes and slid sideways into the moose, knocking the legs out from underneath the moose, which fell into the open box of the truck. The slide ended with the truck plowing through the snowbank into the ditch. It all happened in slomo as he wasn't going fast, and snow made the road slippery. The moose was relatively uninjured, but was now trying to get to its feet in a very slippery snow covered steel truck box. My friend dove for the floor of the cab, expecting to see a hoof coming through the back window of the cab. After several minutes of hooves bashing and crashing, everything got quiet. A quick peek showed that the moose managed to get out and buggered off. The box of the truck looked like a grenade went off inside it. Huge dents from the inside. Truck windows survived, as did the driver and the moose.