How do you remove pet stains from hardwood floors

I have a new dog that I am housebreaking. There are a few places in my bedroom that have dark places on the hardwoods because of urine left on the floors that I did not know was there. Fortunately, the wood is dark with even darker highlights, but the dark stains are actually visible and I am hoping I will be able to remove the stains and return the wood to its natural color. Any suggestions?icon

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