My 1 year old terrier just won't stop! He is driving us nuts. He is an angel in the house and on a walk. However, in the garden he can hear the planes overhead, the neighbours' dogs, people walking by, motorbikes - anything. Basically, he is such a nuisance in the garden that we have to bring him inside.
We say, "shut up", "shh", "no", and take him inside when he barks too much but he doesnt get it.
The only time he is quiet outside is when he is chewing a bone.
In the house he is really quiet and sweet.