I have one (chihuahua mix). He who shall not be touched by strangers. Call him a Tasmanian devil when we visit the vet. We can do anything to him. No one else better even look at him.
You own a Chihuahua? Then perhaps you can explain something. Why are most of the adult Chihuahuas always shivering? At least the ones’ I see are always shaking. Do they tend to have low blood pressure, or are they just naturally as hyper and nervous as a Hummingbird? I do know they can be very good watch dogs, at least to make noise at the unfamiliar squeak.