You are right I didn't walk them, I let them into the yard and threw tennis balls for them for 5 minutes. I later had to go out for about half hour to look for something I misplaced in the open garage so that was a longer spell.
Hibbing MN currently -35 after a high yesterday of -11.9
https://forecast.weather.gov/data/obhistory/KHIB.html
International Falls -36
https://forecast.weather.gov/data/obhistory/KINL.html