What kills rats immediately in the house is typically a large, powerful trap designed for instant kill rather than poison which takes days. For rats, which are larger and stronger than mice, you need rat-sized snap traps, often called T-Rex or large snap traps, with a strong spring that breaks the neck or spine within seconds when triggered correctly. These are much larger than mouse traps and must be placed perpendicular to walls along runways where rat droppings and grease marks are found. Electronic rat traps that deliver a high-voltage shock also kill within seconds and allow no-touch disposal, and are considered humane quick-kill options. Glue traps do not kill immediately and cause prolonged suffering and are not recommended. Rat poisons containing anticoagulants take 24 hours to several days to work and often cause rats to die hidden inside walls causing severe odor and secondary poisoning risks to pets, so they are not immediate. To ensure immediate kill, bait rat traps with peanut butter, bacon, or dried fruit, use many traps at once, set them in areas where pets and children cannot access them, and wear gloves when handling. For heavy infestations or rats in hard-to-reach areas like attics and crawl spaces, contact a licensed pest control professional who can use commercial grade trapping and exclusion.
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