The Chihuahua has a little undercoat, which is why it is quite sensitive to cold. The long-haired Chihuahua often tolerates low temperatures a little better than the short-haired variant. So you can freeze at the right temperatures.
However, Chihuahuas sometimes tremble with excitement, joy, or tension and are then “live”. In addition, it can happen that they are hypoglycemic. This is also expressed by tremors.