1) The breed in general, may bark a lot
. This is not a quiet dog and while one can certainly instill some solid training to cut down on barking issues
, a Chihuahua may bark when hungry, when wanting to play or even just to say, 'Look at me!'
2) He is fragile.
Even those with larger frames are not sturdy dogs that can tolerate heavy exercise, long treks or rough play. Young children will need to be watched when handling the dog so that there is not unintentional injury.
3) Bonding. While very loyal and even sometimes clingy, a Chihuahua may bond with one human in particular as opposed to all people in the family. If the Chi does fall into a pattern of having a preference for one certain person, this may cause issues if others feel left out.
4) Stability.This is not the most even-keeled breed. Some are super shy and some are hyper.