If your dog ate a possum, the most likely outcome is an upset stomach, some vomiting, or diarrhea that resolves on its own within a day or two. But eating a wild animal does carry real risks, from bacterial infections and intestinal parasites to bone fragments that can cause internal damage. The severity depends on how much your dog ate, whether the possum was freshly killed or already decomposing, and whether it had been exposed to any poisons.
Digestive Upset and Bone Hazards
The most immediate concern is what the possum’s body does to your dog’s digestive tract. Raw wild meat is tough on a domesticated stomach, so expect vomiting, diarrhea, or loss of appetite in the hours afterward. For most dogs, this passes within 24 to 48 hours.
Bones are the bigger worry. Small, brittle possum bones can splinter during chewing, and sharp fragments can pierce the intestinal wall as they pass through. This can lead to peritonitis, a serious abdominal infection that requires emergency veterinary care. Signs of a perforation or blockage include repeated vomiting, a swollen or tender belly, refusal to eat, lethargy, and straining to defecate. These symptoms can show up anywhere from a few hours to a couple of days after the meal. If your dog swallowed large portions of the carcass without much chewing, the risk of a physical obstruction in the stomach or small intestine goes up.
Bacterial Infections
Wild animal carcasses are loaded with bacteria. Salmonella and Campylobacter are two of the most common culprits, and dogs that eat raw wildlife can pick up both. What makes this tricky is that dogs often carry these bacteria without showing obvious symptoms themselves, while still shedding them in their feces. That means your dog could feel fine but still pose a risk to you and your family, especially young children, elderly household members, or anyone with a weakened immune system.
When dogs do get sick from these bacteria, symptoms typically include watery or bloody diarrhea, fever, and reduced appetite. Most healthy adult dogs recover without specific treatment, but puppies, senior dogs, or dogs with existing health conditions can develop more serious illness.
Intestinal Parasites
Possums are heavily parasitized animals. Studies examining wild opossums have found that over 65% carry hookworms (Ancylostoma species), nearly 29% carry whipworms, and about 20% carry roundworm-type parasites. Many individual possums carry multiple parasites simultaneously.
When your dog eats an infected possum, those parasites can establish themselves in your dog’s gut. Hookworms in particular are worth noting because they’re the same species, Ancylostoma caninum, that commonly infects dogs. A new hookworm infection can cause bloody diarrhea, weight loss, and anemia, particularly in smaller dogs or puppies. Whipworms and roundworms cause similar digestive symptoms. These infections won’t show up immediately. It typically takes two to four weeks before parasites mature enough to cause noticeable problems or appear in your dog’s stool.
Possums also carry single-celled parasites like Giardia and Cryptosporidium, both of which cause persistent, watery diarrhea that won’t resolve on its own and needs veterinary treatment.
Toxoplasmosis
Toxoplasma gondii, the parasite responsible for toxoplasmosis, is surprisingly common in wild possums. Serological studies in the United States have found infection rates ranging from about 3% to 33% depending on the region, and one study in Mexico detected the parasite in the brain tissue of nearly 77% of captured opossums. Dogs can become infected by eating contaminated raw meat.
Most healthy adult dogs show no symptoms after exposure. But dogs with compromised immune systems, particularly young puppies, can develop fever, muscle pain, breathing difficulties, and neurological symptoms. The greater concern is the household risk: an infected dog sheds the parasite, which can be dangerous for pregnant women and immunocompromised people.
Ticks and Fleas From the Carcass
Even if the possum was dead, its external parasites may still be very much alive. Possums carry a wide variety of ticks and fleas, and these can jump to your dog during or after contact with the carcass. The fleas most commonly found on possums include the cat flea (Ctenocephalides felis), which readily infests dogs and homes.
The ticks are a more serious concern. Possum-associated ticks have been found carrying the bacteria responsible for Rocky Mountain spotted fever, ehrlichiosis, and other tick-borne diseases. If your dog had prolonged contact with the possum, check thoroughly for ticks in the ears, between the toes, around the neck, and along the belly. Remove any you find promptly with fine-tipped tweezers.
Secondary Poisoning Risk
This is a risk many dog owners don’t think about. Possums frequently scavenge in areas where rodenticide bait has been set out, and anticoagulant poisons move up the food chain. If the possum your dog ate had recently ingested rat poison, your dog is now getting a dose of that same toxin secondhand.
Anticoagulant rodenticides work by preventing blood from clotting. Signs of secondary poisoning can take three to five days to appear and include lethargy, pale gums, coughing, nosebleeds, blood in the stool or urine, and unexplained bruising. This is a life-threatening emergency. If you know or suspect that rodenticides are used in your neighborhood, mention this to your vet right away rather than waiting for symptoms.
Rabies Is Unlikely but Not Impossible
The good news is that possums are considered naturally resistant to rabies. Their low body temperature, which runs between 94 and 97°F compared to about 101°F in dogs, appears to make it difficult for the rabies virus to thrive. Reports of rabid possums are extremely rare. In one large surveillance program in Brazil, researchers tested 22 opossums and found just one case, which was linked to exposure from a bat rather than typical rabies reservoirs.
That said, “resistant” does not mean “immune.” If your dog is not current on rabies vaccination and had contact with any wild animal, it’s worth discussing with your vet.
What to Do Right Now
If your dog just ate a possum, start by removing any remaining parts of the carcass so your dog doesn’t go back for more. Check your dog’s mouth for bone fragments stuck in the teeth or gums. If you have dog-specific toothpaste and a canine toothbrush, a gentle brushing can help reduce the bacterial load in the mouth. Do not use human toothpaste, which contains ingredients toxic to dogs.
Monitor your dog closely for the next 48 to 72 hours. Mild vomiting or soft stool in the first day is common and not necessarily an emergency. What you’re watching for are the warning signs of something more serious: repeated vomiting, bloody diarrhea, a bloated or painful abdomen, extreme lethargy, pale gums, or refusal to eat lasting more than a day. Any of these warrants a vet visit.
Even if your dog seems fine in the short term, schedule a fecal exam with your vet in two to three weeks. This gives any parasites time to show up in the stool. Bring a fresh stool sample so your vet can test for hookworms, roundworms, whipworms, and protozoal parasites like Giardia. Clean any area where your dog dropped pieces of the carcass with a diluted bleach solution, and wash bedding in hot water.