I think I agree with the above. Use very wet cloths of some sort to sort of soak that area. After a minute or two, take clean towels and stand on them for a while. Repeat this again. Afterwards, cover the area again with clean dry towels.
I had a cat who was incontinent (he had a bowel disease). He left little messes all over the place. This is the method I used, and it worked quite well. After everything is DRY, if the carpet smells weird, use one of those backing soda based carpet fresheners.
If none of this works: call a professional carpet cleaner, one who wont take you for an arm and a leg! Some companies try to sell you on cleaning ALL of the carpet, not just spot cleaning.