Sometimes the purpose of scratching is not purely about sharpening paws. Instead, they purposely leave a highly visible mark and smell repeatedly on particular object. This happened to declawed cats too.
不要以為貓的磨抓行為真的為了修甲。重重覆覆地於家中某幾樣物品抓呀抓 （每間房起碼一件）。目的是為了留下明顯的“我來過了”的痕跡和氣味。貓即使除爪或者單獨飼養，也會有這個行為。就好像我們每到過一個地方都要Facebook Check﹣in 一樣呢！～