Cleaning and Stain Removal - dog stool stain PLUS medication/oily

Hello, I have a sick dog and the vet put him on "lactulose"which is a stool softener/laxative(he may have colon cancer...). After a few doses of this, he had an explosive oily stool "happening", at night on the carpet, while trying to get to the doggy door in time. So, when I got up in the morning, it had been sitting there for ? hours. I have tried Woolite rug cleaner, a pet carpet cleaner, hydrogen peroxide, and finally, my husband tried Krud Cutter(it says it's for carpets, too).Much of it has come out(I'm concerned, at this point, with thread damage) but we have multi-colored carpet that ranges in color from very light beige to a very light brown.
Is there any hope???
lrprice

Ease of carpet cleaning without damage depends mostly on the type of fibers used to manufacture your carpet. Solution dyed carpet had color added while fibers were in molten state. These can be nylon or polyester. Nylon carpet is often dyed after the carpet has been manufactured. Thus, the dyes are unstable and discoloration or removal of color can occur with certain cleaning products and pet waste. Because olefin carpet fibers are polypropylene/plastic, it is very stain resistant. Pet foods and medications often contain dyes that can become set in carpets manufactured with unstable dyes.

Enzyme digester cleaners are recommended for pet messes on carpet. Enzymes must be given time to digest stains and odor. Repeat applications may be necessary. Dye stains are sometimes successfully removed with solvent cleaner such as denatured alcohol or dry cleaning fluid. (Solvent cleaners are recommended for oil and grease stains.) If stain remains it is likely that it is permanent. If in doubt, call a professional carpet cleaner.