Pet spots removal? Please help. I'm actually buying the machine,as well.?

Alright, I have a few mistakes that I need to clean of the carpet from my puppy. I am purchasing a high rated Hoover carpet cleaning machine. What to I do? Add very hot water, I read on ehow.com and Nature's Miracle? Or do I use anything else as well? Thank u so much! I have company coming over next week.