Chihuahuas are even-tempered and calm when given enough activity and mental exercise. On the other hand, if they are not busy enough, they tend to be jittery and nervous.
Training also plays an important role in whether your Chihuahua is calm or short-tempered. A dog that is anxious, feels that it needs to be the leader of the pack, or always gets attention when requested, may bark, or exhibit aggressive behavior. Jealousy scenes also occur with the Chihuahua. For example, if he does not want to share his reference person.
With consistent training and rules, every Chihuahua can become a quiet everyday companion. On the other hand, you shouldn’t coddle him or let him get away with anything.