So, it’s going down to -21 overnight tonight. With a windchill on top of that. Here’s a friendly reminder from the Ottawa Humane Society
As far as dogs are concerned, it depends on their coat (fur).
Medium coated dogs shouldn’t be outside for more than 10 minutes. More protection is needed for short coated dogs.
The Ottawa Humane Society recommends that you don’t let cats outside any time of year!