We ripped up the carpet & pad in our dinning room & we are going to put down laminate flooring. The problem is though after removing the carpet & pad we discovered areas in the plywood sub-floor where a pets urine has soaked through the carpet & pad all the way through to the sub-floor.It has been there a very long time, we haven't had a cat in the house for a long time.e ripped up the carpet & pad in our dinning room & we are going to put down laminate flooring. The problem is though after removing the carpet & pad we discovered areas in the plywood sub-floor where a pets urine has soaked through the carpet & pad all the way through to the sub-floor.