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Poisons are often used to control rats in large areas or where infestation
is heavy. The most commonly used poison is warfarin, which causes
rats to bleed to death internally. The poison is relatively slow-acting
and often requires the rat to feed multiple times.
Baited rat poisons can be dangerous because they have broad
non-target effects.
Biological control using dogs and cats has historically been important
for rat control, leading to such breeds as the rat terrier. However,
when rats infest a structure, dogs and cats do not usually provide
effective control.
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