Hello all. I recently bought a house and removed the carpet in the dining room to find some very nice finished wood floors. One problem... the previous owner had a cat and certain areas are stained black and one corner the wood has actually shrunk, split and cracked from the constant wet and dry conditions. I would like to repair the floor if I can but I am not aware of anything that would help with the stains and smell. I am going to try sanding a bit off the top to see if that gets rid of the stain but after that I'm out of ideas. What would you suggest?

Thanks, Fred