Our neighbors suck

we moved into a house that is next door to two small apartment buildings. The window to one apartment directly faces the side window to our living room. The people who live there are total trash. They hang out of the window chain smoking, have loud violent fights and beat the crap out of their dog. I have heard the dog whimpering and being beaten on several occasions. The other day when I returned from work the dog, a great Dane, was literally standing with half of its body outside of their window on the second floor. It was apparent that they had leashed him to the curtain rod?!?! He barked all day long.
We have called the apartment complex two times to complain. They never answer or return calls. The next time that they have a screaming match or leave the dog barking all day we are calling the cops, anything else we can do? The man who lives there is a psycho, he is the one that we always hear beating the dog or screaming at his wife. We are making the complaints anonymous because he seems completely insane. I don't know if any of the other neighbors complain because this is completely ridiculous. Im ready to put up a 15 foot privacy to completely block the whole building off.
Re: Bad neighbors
I will do that. They are unbelievable, it's pretty disturbing
"I'll love you forever,
I'll like you for always.
As long as I'm living,
my baby you'll be."
If anything else happens we will definitely call the cops