Many cats scratch furniture like chairs and couches (even when scratching posts are provided for them in the home) because a cat's instinct is to scratch various objects, like trees, as a marker for other cats to see and smell.[13] Trainers suggest guiding cats toward designated scratching objects that they will enjoy, changing the style or location of scratching posts around the house, and making scratching the furniture inconvenient.[14] Some use positive reinforcement training, often accompanied by a clicker, to engage the cat in using the scratching post.