That would be where most smells come from. If so, you can lift up rug and cut out a square where stain is and replace it. When the rug is up, (this trick works even if you don't have padding), hold a wet dry shop vac to backing where stain is, then spray nap of rug with resolve cleaner, the vac will pull it through. Then put fresh warm water through to rinse it. Leave it piled up to dry for a day, then lay back down. Don't know if this will help ya, but good luck.....