Voles are unlikely to physically harm your cat, but eating them carries real health risks. Cats are efficient vole hunters, and the vole itself poses almost no threat in a fight. The dangers come from what’s inside the vole: parasites, bacteria, and potentially rodenticide chemicals that can make your cat seriously ill.
Parasites From Eating Voles
This is the most common risk for cats that hunt voles. Voles serve as intermediate hosts for several intestinal parasites that readily infect cats. The roundworm Toxocara cati, one of the most widespread feline parasites, transmits when cats eat rodents carrying larvae in their tissues. Another roundworm, Toxascaris leonina, spreads the same way. Tapeworms, particularly Taenia taeniaeformis, are extremely common in cats that hunt, and the infection cycle depends on cats eating infected rodents like voles.
A cat that regularly catches voles will almost certainly pick up worms without consistent preventive treatment. International Cat Care recommends deworming hunting cats every one to three months with a product effective against both roundworms and tapeworms. The more your cat hunts, the more frequently it needs treatment.
Toxoplasmosis Risk
Voles can carry the parasite Toxoplasma gondii, which cats contract by eating infected prey. A study of wild Amargosa voles in California found antibodies to T. gondii in about 10.5% of the population, and roughly 5 to 8% tested positive for the parasite’s DNA. Cats are actually the definitive host for T. gondii, meaning the parasite completes its life cycle inside them. Most healthy cats show few or no symptoms, but they shed the parasite in their feces for a period after infection, which is the primary way toxoplasmosis spreads to humans and other animals.
Tularemia: A Serious Bacterial Infection
Tularemia is caused by the bacterium Francisella tularensis, and voles are one of its small-mammal reservoirs. Cats typically get exposed through contact with infected rodents, tick bites, or even inhaling aerosols from infected animals. Outdoor, young adult cats face the highest risk because of their frequent encounters with both ticks and prey animals.
This one can hit cats hard. The disease ranges from mild to severe, with common signs including fever, loss of appetite, lethargy, swollen lymph nodes, and ulcers in the mouth or on the tongue. A retrospective study covering two decades of feline tularemia cases found that every cat with documented housing information had outdoor access. Infected cats frequently developed dangerously low white blood cell counts, reflecting the septic nature of the infection. Tularemia is also zoonotic, meaning your cat can pass it to you, so it’s a risk worth taking seriously.
Secondary Rodenticide Poisoning
If anyone in your neighborhood uses rodent bait, your cat is at risk every time it eats a vole. Oat-based bait pellets are specifically marketed for vole control, and a vole that has eaten this bait becomes a toxic meal for your cat. The Merck Veterinary Manual confirms that pets can be poisoned indirectly by eating poisoned rodents.
Anticoagulant rodenticides, the most common type, work by preventing blood from clotting. A cat that eats a poisoned vole may not show symptoms for several days, then develop internal bleeding, lethargy, pale gums, or difficulty breathing. The risk increases with repeated exposure, since these compounds accumulate in the body. If you know rodent bait is used nearby and your cat hunts, this is one of the more urgent dangers on this list.
Fleas, Ticks, and What They Carry
Voles are heavily parasitized. Research on bank voles found an average of nearly eight fleas per animal, and voles also host ticks and mites. When your cat catches a vole, those ectoparasites can jump ship. Vole fleas carry Bartonella species, bacteria in the same family responsible for cat scratch disease. Ticks on voles can transmit various pathogens depending on your region, including the agents behind Lyme disease and, in certain areas, plague.
Keeping your cat on year-round flea and tick prevention significantly reduces this risk, even if you can’t stop the hunting itself.
Leptospirosis and Hantavirus
Voles, like other rodents, can shed Leptospira bacteria in their urine. A cat doesn’t need to eat the vole to be exposed; contact with contaminated water or soil is enough. That said, the CDC notes that leptospirosis is uncommon in cats, though outdoor cats with rodent exposure do carry higher risk than indoor cats.
Hantavirus is a different story. While rodents are the primary reservoir for hantaviruses, the CDC states that cats and dogs are not known to be reservoir hosts in the United States. Your cat is unlikely to become clinically ill from hantavirus. The concern is indirect: a cat that catches a vole and brings it indoors could expose you to the virus through the rodent’s urine, droppings, or saliva.
Reducing the Risks
You probably can’t stop a determined cat from hunting voles, but you can limit the consequences. Consistent parasite prevention is the single most effective step. A deworming schedule of every one to three months handles the worm burden, and year-round flea and tick products protect against the hitchhikers voles carry.
Watch for behavioral changes after your cat catches prey. Fever, loss of appetite, lethargy, swollen areas around the jaw or neck, or mouth sores could point to tularemia or another infection that needs prompt treatment. If you find a dead vole your cat has been playing with and rodenticide use is possible in your area, monitor closely for signs of bleeding or sudden weakness over the following days.
Keeping cats indoors eliminates the risk entirely, but for cats with outdoor access, the combination of preventive medications and vigilance after hunting episodes keeps most of these dangers manageable.