How do I remove these dark spots of pet urine off my wood floors?

Renee,

I found this instructional that will be worth a try

https://www.hunker.com/12002114/how-to-remove-old-urine-stains-from-wood-floors

I am not sure that you'll be able to get rid of the stains completely without any sanding at all :-(

Would you consider eventually staining the whole floor a darker color? That's what I would do...

Now that is a stained floor! I don’t believe sanding would remove them. If you try the method OceeB found, I would like you to post that as a project on Hometalk, whether it removes all the stains or not. Good luck, Renee! ☺️

The only way I was able to remove it was sanding. If it's a big area I suggest renting a floor sander.

As a flooring expert, I have never found a way to remove urine from wood floors. However, the OceeB website suggestion is worth a try. It will take a lot of time. It may be worth it just to get rid of the odor. I have always found that sanding it the only way to totally rid of urine and then not if it has really seeped down in and there are black spots. When you stain, try not to stain those spots that are dark with the first coat. Let stain dry overnight, then put a second coat of stain going over the whole floor. Let dry overnight, lightly sand, then put on 2-3 coats of a satin poly. If you use satin poly, your floors with not show footprints or dust as easily as a high gloss poly. You may always have some evidence of spots, but you are going to put rugs down and besides, it is part of the history of the floor. Good luck. Your floors are not nearly as bad as I have seen in the past.

Can't imagine the health aspects of having a carpet so saturated with animal urine that it seeps through the carpet and carpet pad to do that to the wood! Or how you'd be able to walk (or have a baby crawl) around on that without facing some health issues. Glad to see you yanked it out, sorry to see the damage/problem you're facing, and hope you're able to resolve it.

They say that pinesol or vinegar

There is a product that you can purchase in an industrial store called It's Alive. It knocks out pet odors very well. But I think you are going to have to sand the floors and then refinish for a perfect stain.

Hydrogen peroxide,spray on and leave it on a few hours,mop up,repeat until gone

Hello,

Stain the whole floor the colour of the darkest stain, then you won't see them.