Ii saw on that Bristish show "How Clean Is Your House?", Fight urine smell with ammonia. They tackled a home where an elderly dog had urinated over and over on a carpet. Pour "sudsy" ammonia in water, whip up some foam, use it to scrub any urine soaked places. When it dries, smells will be gone. Good luck!

I use Natures Miracle for dog urine odors and it works!!!! You can find it at pet stores, I buy mine at Petsmart. Follow the directions and you'll be amazed. I have also used it on a loveseat to kill the scent of cigarette smoke.
Christine

You might want to go over to the Pet forum and see what people over there recommend. I too have always used Nature's Miracle. There are other similar enzyme-based products out there that people swear by.

Here is a link that might be useful: Pet forum

graywings is right about the enzyme-based broducts. I had a friend who was a carpet cleaner years ago and used this big syringe which looked like what you would use for marinade injection today. He would poke it through the backing of the carpet and inject the emzyme product into the padding and that would take care of the smell. Good luck. Most Vets will selll U this product.