After ingesting rat poison, a cat may briefly become hyperactive, followed by fever, loss of appetite, and restless running around. This can be followed by unsteady gait, muscle spasms, and limb twitching. If the rat poison is highly toxic, the cat will die quickly.

When the disease manifests, cats will exhibit symptoms such as foaming at the mouth, vomiting blood, and diarrhea, eventually leading to death. Therefore, if a pet owner discovers that their cat has ingested rat poison, they must take it to a veterinary hospital immediately for induced vomiting or gastric lavage.
If a cat ingests a small amount of rat poison, it may not be in mortal danger and may only show some mild symptoms. However, if it ingests too much rat poison, it may die within half an hour. Therefore, when raising a cat, you must prevent it from coming into contact with rat poison.