When I built my place 3 years ago, I put hardwood floors in the main living area and laminate in the office. My golden retreiver hasn't made any marks at all in either (and I've been lax on clipping her nails!).

I also got a leather sofa when I moved in and bought the extended protection program which would cover any rips or tears. Lucy (the dog) is up on the sofa with us all the time and no problems at all!