We rescued a chihuahua puppy this last winter and it wasn't house broken, and now my carpets stink. Where can I find a good cleaner to keep it clean?

I know how you feel, I just spent half a day cleaning the carpets in my room in my parents house because our cat decided it was a litterbox while I was away at college. 

I have a few ideas for you that encompass a range of prices.  If you don't mind spending a bit of money, I highly reccommend investing in an electric carpet cleaner.  They work wonders for removing pet stains and odor, as well as revitalizing your carpet and making it more visually appealing and softer.  I've attached product suggestions for two different models, one is a smaller, more compact spot-cleaning model, and the other is an upright model. Both run in the $125-$150 range.

Another method is to use a stain removal solution and some good old fashioned elbow grease.  I recommend both the Woolite Pet Stain and Odor Remover plus Oxygen, and Resolve Triple Action Spot Carpet Cleaner.  I have personally used both, and if you get a medium (firmness) bristled scrub brush they work well for getting stains out of carpet.

I hope these help you claim your carpet back! :o)