My dog is 12 years old. He has always barked a lot when we brought in the other dog and not him or something but we ignored it because it wouldn't be for very long. Now she is dead and he barks constantly unless we bring him inside or go outside and pay a ton of attention to him. I can not bring him inside all teh time I go away to college and mom and dad can't either. I have tried ignoring him when he barks and praising him when hes good. Even a shock collar but it doesn't work either he keeps on barking even right after it shocks him. I spent 10 hours with him once inside then put him outside just to go pee and within 2 minutes he was back at the door barking and didn't even go pee yet. My mother says she is afraid someone might hurt him because of how loud he is being and we can't bring him inside so what do we do? How do I make him stop barking?