by Pat M.
My dog is 4 lbs shorthair Black and Tan purebread chijuajua ,she is 9 years old and in perfect health, I got her when she was 8 weeks old she is spayed and she has been aggressive since she was about six months old. She attacks dogs cats people even children . But I don't let her around children. She does all this for no apparent reason. And she barks all the time especially if we have company. I can be in another room and set my coffee cup down and the sound will start her barking, I'm wondering if there isn't some kind of medicine that will calm her down, training doesn't help