I don't really know 'cause we usually don't get temps that cold. This morning it was 20 degrees F when I took Jackson out to potty and we stayed out for about 5 minutes, lol. With the windchill though, it was probably more like 15 degrees or maybe lower. He was fine... I, on the other hand, was wayyy too cold.
Jackson's the kind of dog who gets bored easily, ha. So when we can't go outside for long, we do longer sessions of trick training... doing old tricks and learning new. It stimulates his mind, I suppose
We do about 15-30 minutes of that and maybe 5-10 minutes of fetch at night indoors. And I know it sounds ridiculous, but I will even take him for a car ride so he can sniff out the window. It tires him out.