Cats need place where to scratch their nails especially those who can not go outside. Scratching is an action that provides innate harmony and well-being for cats. The important thing is to find proper place for scratcher it should not deter him from using it. If your cat is scratching somewhere where it is not allowed show him the proper place for this action. Train and teach your cat, eventually some things will become as habit and will tend to repeat that it is important that you teach your cat to avoid bad behaviour.