Cats do attack possums, and it happens more often than most people realize. Whether it ends in a full fight or a brief standoff depends on the size of the animals, the situation, and which species of possum you’re dealing with. In most cases, a healthy adult North American opossum is large enough to deter a cat, but smaller or younger possums are genuinely at risk.
How Cat-Possum Encounters Typically Play Out
Cats are hardwired to stalk and pounce on small, moving animals. An adult Virginia opossum, which can weigh 8 to 14 pounds, is usually big enough to make a domestic cat think twice. Most encounters between cats and full-grown opossums involve hissing, posturing, and eventually one animal walking away. Cats tend to avoid prey that’s close to their own size, especially if it shows teeth or stands its ground.
Young or juvenile opossums are a different story. A possum the size of a rat or squirrel triggers the same prey drive as any other small animal, and cats will readily chase, catch, and kill them. The same applies to smaller possum species. In Australia, ringtail possums, feathertail gliders, and sugar gliders are all frequent victims of domestic cats. Wildlife rescue organizations in Australia report that a high number of possums brought into care have injuries from household cats.
Why “Playing Dead” Sometimes Works
Opossums are famous for involuntarily going limp when threatened, a response called thanatosis. This isn’t a conscious choice. The animal essentially faints, sometimes for minutes at a time, and may also release a foul-smelling fluid to complete the illusion of death.
Research on how cats respond to immobile prey suggests this defense is surprisingly effective. In controlled experiments, domestic cats presented with two quail (one mobile, one in a death-feigning state) attacked the moving bird first in 14 out of 16 trials. Cats left the motionless bird alone to stalk the one that was still active. The catch: if the “dead” bird moved again while the cat was still nearby, the cat came back and attacked it. So playing dead buys time, but it only works if the opossum stays still long enough for the cat to lose interest and leave the area.
The Hidden Danger of Cat Bites
Even when a cat-possum encounter looks minor, a single bite can be fatal for the possum. Cat saliva carries bacteria, particularly Pasteurella, that act almost like a slow poison in a possum’s bloodstream. Within about 8 hours of a bite, an untreated possum can begin experiencing paralysis, and without veterinary intervention, the infection is typically fatal. This means that many possums die from cat encounters that their owners never even witnessed or considered serious.
This is especially well-documented in Australia, where wildlife rescuers see a steady stream of possums with cat-bite infections. But the same bacterial risk applies to North American opossums. A possum that escapes a cat with what looks like a minor wound may still die days later.
Disease Risks Between Cats and Possums
One concern people often have is rabies. Opossums are remarkably resistant to the rabies virus, likely because their body temperature runs between 94 and 97°F, which is lower than most mammals and too cool for the virus to thrive. Reports of rabid opossums are extremely rare. So your cat is very unlikely to contract rabies from a possum encounter.
A less obvious risk runs in the other direction. Cats are the definitive host for Toxoplasma gondii, the parasite responsible for toxoplasmosis. Cats shed the infectious stage of this parasite in their feces, contaminating soil and water. One study of wild opossums in Mexico found the parasite in nearly 77% of the animals tested. While the exact role opossums play in spreading toxoplasmosis isn’t fully understood, the high infection rate shows how thoroughly outdoor cats contaminate shared environments.
Opossums also carry their own parasite, Sarcocystis neurona, which causes a serious neurological disease in horses called equine protozoal myeloencephalitis. Cats can become intermediate hosts for this parasite after contact with opossum droppings. If you have horses on your property, the combination of outdoor cats and visiting opossums creates an indirect transmission pathway worth being aware of.
What Affects the Likelihood of an Attack
Several factors make a cat more or less likely to go after a possum:
- Size of the possum. Adult opossums are roughly cat-sized, which acts as a natural deterrent. Juveniles and smaller species like Australian ringtails are at much higher risk.
- Time of day. Possums are nocturnal, so nearly all encounters happen after dark. Cats that are outdoors at night are far more likely to cross paths with them.
- Food sources. Outdoor cat food is the single biggest attractant. Possums are opportunistic feeders and will follow the smell of kibble directly to your porch, your cat’s shelter, or your garage.
- Cat temperament. Some cats are aggressive hunters and will attack animals close to their own size. Others are indifferent. Cats that regularly bring home birds and rodents are more likely to engage with a possum.
Reducing Nighttime Confrontations
The most effective strategy is removing what draws possums to your yard in the first place. Pick up outdoor cat food before dark. If you feed your cat outside, do morning feedings only and bring the bowl in well before sunset. People who leave food out after dark routinely report entire possum families showing up on their porches.
If your outdoor cat has a shelter or cat house, keep food at least 10 feet away from it rather than inside. Possums are drawn to easy meals, not to the shelter itself. Once the food is separated or removed, possums rarely bother entering an occupied cat house.
Keeping your cat indoors at night eliminates most of the risk entirely. Possum activity peaks between dusk and dawn, so a cat that comes inside by early evening will almost never encounter one. For cats that resist being kept indoors, motion-activated lights or sprinklers near feeding areas can discourage possums from lingering long enough for a confrontation to develop.