Take it to an animal shelter or put an ad in the paper.
Go get medical help for yourself
If I had to guess I would say it cowers and pisses because its so scared of being abused more by you.
and/or
you are not only a horrible person you are a horrible trainer, the dogs reflect on the owner your neglect isnt teaching it anything
hope this helps
also try calling 911 with your story and answer a few questions for them and they might send someone to help