Chihuahua's

I have recently discovered how hard it is to have a dog. It is seriously like having another child. I rescued a chihuahua from a guy I work with. Big mistake! I do not understand how this tiny little creature can piss so much. I only had her a week before my house smelled like a porter potty. Gross! I have read the books, watched the infomercials and looked up on utube how to potty train this particular dog. I have come to the conclusion that it is impossible!