If the stain is from red wine this is how coit cleaning suggests treating the spot which is the same as treating this stain on wool carpet.
Clean a stain out of a wool carpet.
Let the water stand for 30 seconds.
If the stain is already set try applying white vinegar and water to the stain and lightly rubbing it in.
Then apply plain warm water to the stain and gently rub it into the carpet with a cloth.
Using a clean white cloth sponge the stain with the mixture applying a little bit at a time and blotting frequently with a dry cloth until the stain disappears.
Sponge with cold water and blot dry.
To clean a fresh stain on a wool carpet start by scooping up any solids and blotting the stain with a dry paper towel.
Repeat until no more stain is transferred onto the cloth.
If you don t want to use chemicals use a combination of water and dish detergent or water and white vinegar.
If you re working with a particularly stubborn stain you can treat it with a stain solution first.
Rinse with warm water repeating treatment until no stain is evident on cloth or towels.
Blot the stain with a clean dry cloth or a paper towel soaking up the water and the stain and replacing the cloth as it becomes wet.
Pour a small amount of cold water onto the wine spot to dilute what remains of the stain.
If the stain is fresh blot up any extra liquid with a white paper towel or cloth.
This is how you get stains out of carpets yes even dog pee follow these steps to rid carpets stains caused by pets wine food and even urine and vomit.