If your cat ingests a mouse that's already consumed a pest poison, it's possible your cat may get sick, though it'd be unlikely. The amount of poison a mouse needs to ingest to be deadly is very small in terms of what a cat would need to ingest to have the same effect.
Can mouse poison hurt cats?
Mouse and rat poisons won't harm dogs or cats. The most common rodenticides cause one of three things: internal bleeding, brain swelling, or hypercalcemia (high calcium level, which can lead to things like kidney failure). Keep mouse and rat poisons well out of reach of pets.
How long does it take for mouse poison to affect a cat?
After ingesting this type of bait, it takes 1-2 days for vitamin K1 and clotting factors in the body to be used up. Next, it takes 3-7 days before signs of poisoning occur due to blood loss.
Can cats get sick from eating poisoned rats?
Primary poisoning refers to an animal directly consuming a rodenticide bait. This can occur when a bait is installed unprotected (i.e. in accessible areas, or not within a tamper-resistant bait station) into an area where non-target animals such as dogs or cats may encounter and feed upon the bait.
What happens if an animal eats a poisoned mouse?
The answer is yes, a dog can get sick and die from eating a poisoned rat or mouse. It's known as secondary poisoning as it gets into your dog's system via a rodent already poisoned. According to a pest control expert I spoke to, in most cases a dog will be sick after eating a poisoned mouse.
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