Scratching without worrying that the owner might pick on them, cats have shown high improvements in reducing their stress levels. Less stress means lower blood pressure and relaxed muscles. If cats are anxious or frustrated or even happy and excited digging their nails into the right type of material can help them release a part of the built-in emotions. So it is important if you want your cat to live a less stressful life around you to invest in a cat scratching post.