As far as I know, wood planks will have the same problems, unless you finish them with something that seals the cracks fully (even though they are locking, do you use adhesive?). Also, with any wood floor, urine can soak in eventually if you don't catch the accident soon enough, depending on how worn the top layer's coating is. I would throw down some plywood and then glue on a floor of linoleum/vinyl as a solid sheet for fuzzy proofing. That is what I am going to do now in my apartment. Good luck, Laryssa [Posted in FML 6301]