Thinking/hoping that replacing the carpet would fix the problem? We're not ready to buy, but we're looking at open houses. We saw an almost otherwise perfect house, but I noticed the smell as soon as we walked in the door--strong too. I could still smell it after being there almost 20 minutes. I've had cats my whole life so I'm not sensitive to the smell. It was all through the first floor and the finished basement. I couldn't smell it on the second floor though. The house was empty so I wonder if maybe that made it seem worse than it actually is. 
