No, each foot has an oversized roller pad designed to be floor-sensitive.
Hard wood floors
It depends on the attitude of your pet. Some might, but they will do hardly any damage.
Hard wood floors can be vacuumed. Be sure to turn the beater bar on your vacuum off so as not to scratch your floor. It is recommeded you use the hose attachement and vacuum that way as you can get in the corners and along baseboards safely without damage to your floor.
Hard wood floors are considered better than carpets if someone has an allergy because carpets hold dust and pollen far more. Hard wood floors are also easier to clean. Carpets are better at giving a warmer feel to the room and are softer on the feet.
Yes, there are specialized nail cutters for pets.
That depends what kind of 'film' it is.
Vinegar and water
It depends on who you get to do the job .I did it myself and it wasnt that hard
Oil based cleansers are great for hard wood floors. Water or too many chemicals can really mess up hard wood floors. Every once in a while you can use the steam shark it works great.
wet paper towel with soap
Basic prefinished hard wood can be had for much less than parquet.