How do I know if my puppy is cold in the house?

he stopped sleeping in his bed and comes to me at night when it’s colder, i put a blanket over him and he’ll sleep the night without trying to remove it as i got it as him being cold and started putting his little sweaters on, i’ve tried different styles to see if he needed thicker or thinner clothes but he’ll spend the entire evening trying to take them off. could it be because this is his first ever winter so he isn’t used to clothes? how do i know if he’s cold? he’s still a baby so everything is a toy and he’ll spend hours playing with things. so what do i do? i don’t want him to be cold and uncomfortable but he won’t let the sweater stay still
How do I know if my puppy is cold in the house?
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