This can be answered in a number of ways, there are a few factors when trying to figure out why chihuahuas shake or if it is cause for concern. The main reason why your chihuahua is shaking could be one of the main reasons humans shake, to warm up.
Sleep apnea is a not so well known sleeping disorder that causes the person or animal or your chihuahua to stop breathing in the middle of it’s sleep. Either by obstructions of the airways, allergies, the position they sleep in, or just because they get so relaxed their brain is forgetting to breathe. It can be cause for concern, and in some rare cases it could cause death.
