Q: Pet urine has bleached out a couple of spots on our red oak floor. Is there anything I can do to restain and match the floor to minimize the white spots from the pet urine bleach effect? A: You could try just sanding down and refinishing the affected boards, but I think you might [...]
Black Stains (a.k.a. Pet Stains)

We just purchased an old house that has dark pet stains on the hardwood floors. I have read several tips and I am thinking that I should use the 50%-50% bleach and water to start. Should the floor be sanded first? The house is going to be used as a rental and we are trying to conserve money. Do you have any other suggestions?
Some friends of ours had their hardwood floors refinished by professionals. The floor looked perfect after sanding, before the finish, but after the finish was applied, dark pet spots appeared. I am refinishing my floors and don’t want the same to happen. My sanding is complete and floors look good now, but is there the chance that the same will happen? Or was something done incorrectly to cause this to happen to our friends floor?
I just sanded an old oak floor. There was old carpet over it. It was very filthy. I sanded with 20 and 36 grit, but there are stains in wood that won’t come out. How can I get rid of them?
I’m noticing new dark/black spots on my hardwood floors. Should I be concerned? What causes this?
Is there a product that will remove pet urine stains (black discolouration), which were found beneath carpet underlay? The floors are 51 year old oak hardwood, and large areas of the dining and living room are affected.
I am refinishing my 45 year old oak floors. When I removed the carpet there were 3 dark stains. I figure it is pet urine. Sanding is finished, but the stains are still visible. If I apply a darker (perhaps cherry oak) stain, will it hide the urine stains or will they just get darker? Could I apply less stain to the spots to try to even it all out?
We have discovered many black stains on the hard wood floors after we pulled out the carpet. We tried to sand them out. While some got lighter, others did not. There seemed to be a smell of urine during the sanding, so I’m assuming that these stains may be from pets. Is there anyway to get these black stains out?
I just had older Oak floors refinished. They are approximately 40 years old. There were black stains in the hall way that would not come out when sanded. We kept the floor stain the same as the original but the black stains look horrible. Would you suggest restaining the floors a darker color so the darker stains won’t show as much? We are in the process of fixing up this house to sell.
My dog peed on our floor and we did not notice this until the next day. After cleaning up the mess, I noticed that the finish had lifted and peeled on one side of the wood slat. The wood in not discoloured but you can see where the finished has peeled. Can I try and apply polyurethane to that one spot or is it better to sand the whole slat and then apply polyurethane to the whole slat of wood?
I have old urine stains on my hardwood floors. There is no odour or buckling, just dark marks. When the moisture is high these areas become damp. How do I stop this?
We have recently removed carpet from a house that I have lived in for 2 years. The carpet had been down for 10+ years and it was used by the previous owner””s dog as a bathroom. Under the carpet is hardwood, but is has urine stains. The carpet pad was stuck to the floor and some of the staples were rusted. Upon removing the pad and scrubbing the floor, there are light stains left by the mess. What do we need to do or use to restore the floor to the way it should be–pretty and unstained?
We took carpeting up from our bedroom which has hardwood floors underneath. When cleaning the carpet from pet urine there are severe dark watermarks. Is there a way to lighten the marks before sanding and refinishing?
I found your web site while searching out how to manually try and fix several pet stains my dog has made on my hardwood floors. I have floating hardwoods that I believe were put in on top of a tile floor. Unfortunately the dog has had a couple of accidents in his old age. There are three none bigger than the palm of your hand. I don’t want to have to replace the floor if not absolutely necessary (I’m not sure I could even find replacement boards since the floor was put in prior to my owning the house). Is there anything I can do cleaning wise to try and pull the stain out of the wood? I did read on your site one of you visitors tried hydrogen peroxide and was able to bleach the stain out of their wood but I’m not sure if that will work for a pre-finished floating floor systems. Do you have any suggestions?
I recently removed 30 year old carpet from hardwood floors. I discovered some spots that were dark black (I am guessing pet stains). I applied hydrogen peroxide to them and after a few treatments, the black stains lifted and the wood was left white. I chemically stripped a 3 X 1 rectangle around the white spots so that application of stain would be even and not spotty. My problem is that the white spots in the wood are now not taking the stain as dark as the chemically stripped areas. Is there anything I can do?
We have a few small stains on our hardwood floor. They are either from water or from paint. Can we sand and recoat just those small spots, or would we have to do the whole floor?
I’m planning on re-finishing my hardwood floors after discovering black, and I mean black, pet stains. I’d had some boards replaced before for the same reason, and thought I solved the problem with the dog, but not so. I didn’t have the floor resanded and refinished, then, just boards being replaced after being taken from another room.
I recently removed my living room carpeting, as it was filled with pet stains. The hardwood floor underneath was for the most part in good shape. There are a few areas where the finish has come off the hardwood floor. The floor boards are in great shape, no warping and the floor cleaned up nicely. However I want to know if I can just refinish these areas of the floor if there are no deep stains or smells. Can I re-stain these areas of the floor without having to refinish the entire floor?
We just pulled up our carpet, and there are severe (water) black spots.
We just purchased a home with hardwood floors throughout; however they all have dark brown stains. We do not know if it is from water damage or from pets; my husband think they are urine stains from the previous owners pets. We would love to keep the hardwood floors and are hoping that the stains can either be removed or be covered. Can you please tell us what we could do to save our floors? Can we stain them darker to hide the stains if we are unable to remove them?
