We get as cold as -40 celsius here.. I start limiting our time outside once it hits -25 celsius. Under -25 celsius, we usually can go outside for 45 minute intervals.

If you keep your dog outside and play or w/e you do for the same amount each day as the weather gets chillier, they should adjust as they are very adaptable. Just make sure they have some water which helps keep their body temperature regulated.

I do reccomend doggie boots. All brands WILL fall off sometimes if you're romping through the snow, but they are good for going for walks.

Doggie coats - not really needed for long haired.. but it's a good idea for short haired if you want to keep up their excersise.