There are both long-haired and short-haired chihuahuas, so both.
Most all chihuahuas bark to much.
Some of them are the normal chihuahuas you see everywhere and the others are long haired chihuahuas.
Mexico.
15 years
it does not make a difference if they are long haired
Yes as long as you socialize them when they are puppies.
4 to 6 inches if that long
10-12pounds
about 15 years
Chihuahuas come in both short hair and long hair versions. There is no way to determine which one it will be except for raising the chance for a short hair or long hair by breeding two of that type.
Yes. There are long haired chihuahuas mixed with terriers. They look very much like a long haired chihuahua but are slightly larger. They vary in size and can be between 8-15lbs. Mine is about 14 which is on the heavier side.