Cats are naturally curious and playful, often mistaking string, yarn, or similar linear objects as toys. When swallowed, these materials do not digest and can bunch up in the intestines, creating a dangerous obstruction known as a linear foreign body. This blocks the passage of food and can cut into the intestinal walls, leading to peritonitis, infection, or rupture. Early signs include repeated vomiting, diarrhea, abdominal pain, and dehydration. Diagnosis typically involves X-rays or ultrasound, and treatment may require surgery to remove the material. Recovery can be lengthy and costly. To avoid this, never leave strings unattended and provide safer cat toys.