Some toys that attract cats the most will also be a health hazard for them. Consider ribbon, yarn and string. Although they’re a classic kitty play toy, and they often make for a perfectly idyllic scene to watch, they do pose some problems. If it’s long enough, for instance, a cat could roll around and get caught in a ribbon or yarn, which might strangle it. Plastic bags can also suffocate cats.
But the most common warning against ribbon, yarn and the like is that if a cat ingests it, it can cause blockage in the intestine. Ingestion is also a danger for rubber bands or feathers. And small balls and other objects are always a choking hazard. If you do find string that’s been partially swallowed (or coming out of the rectum) don’t try to pull it out, as it could cause fatal intestinal damage. Instead, take the cat to the vet as soon as possible. Source: AnimalPlanet