Solid Hardwood, Engineered and Laminate Flooring - dark spots on floor

My husband and I started a project of pulling the carpet in our bedroom up and wanted to stain the wood floor underneath but when we pulled the padding up we realized that the floor beneath had dark spots. The spots we think are from pet accidents that we cleaned up but maybe never dried completely.? Can we get the stains out without replacing the wood? Or can we just stain it without the spots causing dark areas where the spots are now? Please help I'd like to move back into my room soon!

Pet urine stains tend to be permanent. You can try using wood bleach. If that does not work, perhaps using a dark stain will camouflage the pet urine stains.