Keeping your dog warm in the winter?

My dog lives inside- the inside temp is 74 all the time. But when I get up in the morning he's been shivering! When I get back from class he's fine. He's not a tiny dog, he weighs 40lbs but he has a very short, thin coat that I wouldn't call a double coat, or at least not a very thick one. I have an... show more My dog lives inside- the inside temp is 74 all the time. But when I get up in the morning he's been shivering! When I get back from class he's fine. He's not a tiny dog, he weighs 40lbs but he has a very short, thin coat that I wouldn't call a double coat, or at least not a very thick one. I have an outdoor coat for him for when we go on long winter hikes but isn't it dangerous to leave clothes on dogs when you're not watching them? In case their nails get caught or they snag?
Update: He is a shar pei mix
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