I was having an argument with my daughter yesterday. She says she doesn't like Chihuahuas because they are nervous and afraid of everything when the get to be adults. She said they all shake because they are nervous of everything. I said that's not true it depends on the dog and also on how it was raised. I said most Chihuahuas don't know they are small they are like big dogs in little body's and aren't afraid of anything. My Charlie doesn't shake unless he's cold. In your opinion do you find in general that most Chihuahuas are nervous and afraid or tough little big dogs.