If you run a multiple cat household, you're aware that they come with certain special needs. You need more litter boxes, more food trays, and you also need more cat scratching posts. If you don't have enough cat scratching posts for all of your cats, some of them will feel stress and they may choose other places to scratch. Learn about the special cat scratching post needs of multiple cat households here: "Multiple Cat Households Have Special Cat Scratching Post Needs."