Cat’s nails grow in layers, so it is normal for owners to find that their cats’ nails fall off in pieces. Cat's nails play a big role. When the cat grinds its claws, buries feces, or exerts too much force, it will cause the nails to fall off. As long as the cat's nails are not red and swollen, there will be no problem. If the cat's nails are red and swollen, the owner needs to apply medicine to them.