Dog Aggressive After Having Puppies?

My Shih Tzu cross had pups almost a year ago and she is driving me nuts. She is still very aggressive. She hates other dogs, barks all the time, and goes after other dogs. She doesn't like people coming near the house. She does not listen at all anymore, and has been doing her business in my house, even minutes after being let outside. How do I stop this?

By Jennifer