Pet odor neutralizers are available at any pet store. Just make sure that the one you choose is safe for the surface you are cleaning.
This should be done before you introduce any cleaners to the surface.
Then spritz the area with cold water and blot again, repeating until all visible signs of the feces are gone. The goal is to rinse the area without fully drenching the area with water, as this could drive the stain further down into the carpet. Try to avoid rubbing the carpet where possible. This can damage the fibers, thus altering the texture and appearance.
Repeat this several times for maximum benefit. If you do not own a wet-dry carpet cleaner then consider hiring one or employing a professional carpet cleaning company to do there best. However, be aware that diarrhea can and does stain, so if you cannot get the carpet cleaned swiftly, (before it dries fully) then consider using these alternative methods by hand.
Spray the area with this solution and then soak up the excess. To clean the solution out of the carpet spray the carpet with clean water and then blot it up as you did with the solution. The benefit of this method is that it is good at removing odor, so even if the carpet is marked there is a reduced risk of odor attracting the dog back. Test any cleaner on your carpet before using it. Test the color-fastness of the carpet in a discrete spot, where you won’t notice too badly if the color does run. [4] X Research source
An alternative cleaning solution that has a strong deodorizing properties can be made by mixing 16 fluid ounces of hydrogen peroxide with 1 teaspoon of dish-washing liquid and 1 tablespoon of baking soda. Work this into the stain and leave it to soak in for 5 minutes. Absorb the excess with paper towel. Then use fresh water to rinse the area and gently mop up the excess with absorbent material. As a final step you can sprinkle the area with bicarbonate soda and let it sit for an hour or so. This will pick up any lingering scents. Simply use your vacuum to pick up the bicarbonate soda when it is done.
