How cold is too cold for a miniature pinscher puppy?

I have a 15 week old min pin puppy who of course has very short hair. He sleeps in a crate with a cushioned doggy bed inside. I like to keep the house cold at night like 67 to 68 degrees and layer up with blankets but he doesn't have blankets and I know it's colder on the floor. Does he need to sleep with a cover to keep him warm?



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