Make your yard spot and keep it shoveled when it snows.
I like having a bell strap on the door. Shake it every time you go out. Eventually you can encourage the dog to do it if they donāt pick up the idea on their own.
Until then itās always āoutside!ā after food/drink, every couple hours, whenever they go inside, etc.
I recommend only positive reinforcement. If they go inside itās a gentle āuhoh! Letās go outside! ā¦(ring bell and go outside)ā. Pick them up mid potty if you can. Negative reinforcement isnāt fair, accidents are not the dogs fault. Get a treat that makes them crazy, like freeze dried liver - and make sure you have one on hand to reward immediately whenever they go potty outside.