Black Pet Stains Hardwood Floors

It would be easier if you removed the mess right away.
Black pet stains hardwood floors. White vinegar baking soda and hydrogen peroxide are common suggestions to clean up a urine stain on a wood floor. Mix one cup of vinegar into a warm water filled bucket and the add some drops of grapefruit oil to the solution to get rid of the odor. Make your own hardwood floor cleaning solution by mixing a cup of white vinegar into a bucket of warm water. Vomit can sometimes make hardwood floors lighter or darker.
The color it stains the wood floor will depend on the acidity of the vomit. Usually darker hardwood stain colors such as ebony jacobean dark walnut or royal mahogany will do the trick. Sadly mopping or scrubbing the rings with regular cleaners does nothing to improve their appearance and may make urine odors more obvious. But sometimes it happens in hidden areas of your house where you sometimes notice after sometime or when you encounter a lingering odor.
Alternatively another option is to sand and stain the floors a dark color one that is dark enough to cover up the stains. More than likely your best bet is to sand down your hardwood floors. Dog urine soaked into hardwood floors is a common culprit for dark stains on a wood floor. Known as natural disinfectant and deodorant ordinary white vinegar you have in the kitchen is a great tool for removing these stains.
Chose a dark stain to cover up the pet stains. White vinegar is known to have a disinfectant and deodorizing effect which can help with your pet stains.