>>997741If he is part chihuahua he will probably hate any kind of cold and be pretty intolerant to cold. My dog hardly will leave my porch if it's below freezing. He's not a chihuahua, he's a French bulldog, but that single layer short cost really isn't good for cold. A lot of dogs like yours with the lighter coat just so not tolerate any cold at all.
With him being so small, he's probably do fine sleeping in your sleeping bag, as long as he likes it.
