You should replace your cat scratching post when it’s been physically clawed to pieces or you notice that your cat isn’t using it as much as they used to. Most last between 6 months and 2 years depending on the quality of the material and how frequently your cat uses it. Sometimes a cat can dislodge pieces that may be hazardous to them, so if you see yours looking worse for the wear, it may be best to err on the side of caution and replace it.