After the previous owner cleared out all his furnishings and rugs, I realized how extensively the beautiful wood floors had been damaged by 27 years of dog and cat urine saturation. There are several large, darkly stained and warped areas ... Sand the floor to take up the urine mark in the stained areas. It will be difficult to re stain a limited area and try to make it match or blend into adjacent surfaces. Alsoanbsp;...