Jack Russell Training…

My fiance and I just adopted a 1 year old Italian Greyhound who is not potty trained! I need some advice on training this dog. We have 2 1/2 year old Italian Greyhound and I had no problems training him. I’m just unsure about how to go about it. I just keep priasing him and rewarding him with treats when he does the right thing. He hasn’t peed in the house yet, but he’s pooped 3 times (we’ve only had him a day). Another problem is that we live in NY and it’s been FREEZING lately! Please help!!