My son doped his wieght lifting set and made a couple of dents in my Pergo. I installed the type that you have to glue and strap when installing. They had some matching color putty that I filled the holes with and sanded smooth. Worked pretty well.If the Pergo is the newer snap and lock that you do not have to glue then I would suggest to replace the planks. It should not be that hard. If the damage is too large for putty on the glue type, I remember reading on the installation instructions that there is a way to cut out and replace. If I remember right they suggested having a professional do it. That looked a little tricky and I think I would have it done before I made a bigger mess out of the problem.