Cats do catch rats, but far less often than most people assume. While cats are efficient hunters of mice, lizards, and birds, adult rats are large, aggressive, and surprisingly dangerous prey. The reality is more nuanced than the classic cartoon image of a cat chasing a rat: cats can and do kill rats, but they rarely control rat populations in any meaningful way.
Cats Hunt Rats, but Not All Cats Will
Not every cat is a rat catcher. A study tracking individual hunting behavior found that out of 26 prolific hunters, only four specialized in black rats. The rest preferred smaller, easier targets like birds, lizards, or mice. Cats that did focus on rodents were remarkably efficient, with success rates between 83% and 100% of their attacks. But those were the specialists. Most cats simply avoid picking a fight with an animal that can weigh over a pound and bite back hard.
Feral cats eat more rats than pet cats do. Studies of feral cat diets show rodents make up roughly 32% of what they consume, with birds close behind at 29%. But “rodents” includes mice and other small species, not just rats. The proportion of actual rats in that number is smaller still.
Why Rats Are Harder to Catch Than Mice
An adult Norway rat, the species most common in cities, typically weighs 200 to 500 grams. That’s several times the size of a house mouse. Rats are also more aggressive when cornered and will fight back with sharp incisors that can inflict deep puncture wounds. For a cat, the risk-reward calculation is often not worth it, especially if the cat has other food sources.
Hunting skill also depends on early life experience. Cats raised with their mothers for longer periods had fewer failed attempts when catching prey in controlled studies. Kittens learn hunting techniques partly through observation, which means a cat raised without exposure to live prey may never develop the confidence to take on a rat. Indoor-only cats actually show more interest in predatory play than cats with outdoor access, likely because of boredom and lack of real hunting experience, but interest and ability are two different things.
Cats Scare Rats More Than They Kill Them
One of the most detailed studies on this question tracked cats and rats at an urban waste recycling facility. Over 79 days and nights of observation, researchers recorded 259 cat behaviors. Out of all those observations, cats pursued a rat only three times, and only once across an open space. That’s it. Three chases in nearly three months.
The cats did have an effect, just not the one people hope for. On days when more cats were present, rats were significantly less likely to be spotted in open areas. For every additional cat sighting, rats were 1.19 times more likely to move toward shelter. But the rats didn’t leave. They shifted their movements, avoided open ground, and continued thriving in the same colony at high density. The rat population stayed intact.
This is why ecologists are generally skeptical of using cats for rat control. The cats change rat behavior without reducing rat numbers. Meanwhile, the cats pose a well-documented threat to birds, lizards, and other smaller wildlife that can’t simply retreat to a burrow.
Hunting Is Instinct, Not Hunger
A well-fed cat will still hunt. Predatory behavior in cats is driven by instinct rather than appetite. Cats frequently kill prey they have no intention of eating, which is why your indoor-outdoor cat might deposit a dead mouse on your doorstep without taking a single bite. This disconnect between hunger and hunting means that feeding your cat more won’t stop it from stalking wildlife, but it also means that a hungry cat isn’t necessarily a better rat catcher. The drive to hunt and the drive to eat operate on separate tracks.
Health Risks to Cats That Hunt Rats
Catching rats exposes cats to several serious health threats. Understanding these risks matters whether you have a barn cat, an outdoor pet, or a feral cat colony on your property.
Toxoplasma gondii
About 30% of wild rats carry Toxoplasma, a parasite that cats pick up by eating infected rodents. The parasite actually changes rat behavior to make them less afraid of cats, essentially engineering its own transmission. Once a cat is infected, it becomes the only animal that sheds the parasite’s tough, long-lasting eggs into the environment. These eggs can then infect humans, other animals, and soil, where they persist for months.
Leptospirosis
Wild rats commonly carry Leptospira bacteria in their kidneys and urine. One study found pathogenic Leptospira in 27% of rat kidney samples and 16% of urine samples. Cats can pick up the infection through contact with rat urine, contaminated water, or bite wounds. While cats tend to show milder symptoms than dogs, they can still become carriers.
Rat Bite Injuries
Rats that fight back can inflict small, deep puncture wounds. These bites carry a risk of rat bite fever, a bacterial infection that can become serious without treatment. Any cat that comes home with unexplained puncture wounds, especially around the face or paws, should be watched for signs of infection like swelling, discharge, or fever.
Secondary Rodenticide Poisoning
This is one of the most dangerous and underrecognized risks. If a rat has eaten anticoagulant poison (the most common type used in bait stations), a cat that eats that rat can be poisoned secondhand. Symptoms typically appear two to five days after exposure and include lethargy, loss of appetite, difficulty breathing, pale gums, and unexplained bleeding. Cats in documented cases showed internal chest bleeding, blood in their stool, bruising, and skin hemorrhages. Without treatment, secondary poisoning can be fatal. If you use rat poison on your property and also have cats, you’re creating a direct pipeline for this kind of exposure.
Are Cats a Good Rat Control Strategy?
The short answer is no, at least not as a primary method. Cats can catch and kill individual rats, particularly smaller or juvenile ones. But the urban research is clear: even in spaces where feral cats actively patrol, rat colonies persist at high density by adjusting their movements and timing. The rats become more cautious, not fewer.
Cats may provide a mild deterrent effect. Their scent and presence can make an area less comfortable for rats, which could discourage new rats from settling in a space that doesn’t already have an established colony. But for an existing rat problem, cats are not a reliable solution. Effective rat control still depends on removing food sources, sealing entry points, and eliminating harborage sites where rats nest and breed.
For people who keep barn cats or outdoor cats in rural settings, rats will occasionally end up as prey. Cats with strong hunting instincts and early exposure to live prey are the most likely to take on rats. But even those cats tend to prefer easier targets when they’re available.