The idea that getting a cat solves a mouse problem is one of the most persistent beliefs in pest control. And it's partially true — cats are predators, and some cats are excellent mousers. But the research tells a more complicated story.
Cat scent deters some mice. The presence of cat urine and dander triggers an innate fear response in mice. Studies show mice avoid areas with cat scent, and this effect can reduce mouse activity in some situations. However, established mouse populations that have been coexisting with cats in a structure often habituate to the scent and resume normal behavior.
Most domestic cats are inefficient hunters. A 2018 study published in Frontiers in Ecology and Evolution found that feral and outdoor cats have moderate success rates hunting rodents, but well-fed indoor cats are significantly less motivated to hunt. Many house cats will watch a mouse walk by with casual interest and return to their food bowl. Hunting instinct varies enormously between individual cats and breeds.
Cats don't catch enough to eliminate infestations. A single mouse pair can produce 60+ offspring per year. Even an active hunting cat killing one mouse per week can't keep pace with the reproductive rate of an established colony. Cats are supplementary predation, not population control.
Prevention, not elimination. Cat presence (scent and occasional predation) is most effective at deterring mice from establishing in the first place — not at eliminating existing populations. A home that has always had a cat may have fewer mouse problems than identical homes without cats, because mice avoid establishing in areas with predator scent.
Barn and farm settings. Working barn cats — typically semi-feral, outdoor cats specifically maintained for rodent control — are genuinely effective in agricultural settings. They're highly motivated hunters with constant access to rodent populations. This is a very different scenario from an indoor house cat.
Toxoplasmosis risk: Cats that catch and eat mice can contract Toxoplasma gondii — a parasite that's particularly dangerous for pregnant women and immunocompromised individuals.
Rodenticide poisoning: If you're also using rodenticides (rat poison), a cat that eats a poisoned mouse can suffer secondary poisoning. This is a strong argument for using snap traps instead of poison in homes with cats.
They bring "presents." Cats often bring live or partially alive mice into the house rather than killing them cleanly, releasing them into rooms where they escape and establish new harborage.
Barn owls: A single barn owl family consumes 3,000+ rodents per year. Installing a barn owl nest box on a rural or suburban property provides genuine, measurable rodent population reduction. Owl boxes cost $30–60 and can be placed on poles or buildings.
Rat terrier breeds: Dogs bred for ratting (Jack Russell Terriers, Rat Terriers, Dachshunds) are significantly more effective rodent hunters than most cats. Some pest control companies in agricultural areas employ "barn hunt" dogs for rodent control.
House centipedes: Won't catch mice, but they're voracious predators of cockroaches, spiders, and silverfish — the other pests sharing your home.