corn cob
ToxicA corn cob does not digest and does not deform, so it lodges in the small intestine and causes complete obstruction. It is one of the most common surgical foreign bodies in dogs.
This food guide has not been reviewed by a veterinarian. It summarises general information from sources and should not be used to decide whether a food is suitable for an individual dog or to assess an emergency.
Check before feeding
Do not offer as a treat
There is no recommended treat portion for this hazardous item. If swallowed, contact a vet with the amount, time and product details. Do not induce vomiting yourself.
Signs and health concerns
This list includes both observable signs and conditions identified through examination or testing. It cannot establish the cause or whether an exposure is safe.
- Repeated vomiting
- Loss of appetite
- Lethargy
- Abdominal pain
- Not passing stool
- Dehydration
- Collapse
More about this food
A corn cob is dangerous for mechanical reasons, not chemical ones. It does not break down in stomach acid, it does not squash flat, and its diameter is exactly the wrong size to pass. Once it clears the stomach it typically wedges in the jejunum and causes a complete intestinal obstruction. This is one of the most frequent surgical foreign bodies emergency clinics see, and it is routinely missed by ingredient-based toxic-food lists precisely because there is no toxin involved. The kernels are not the problem: plain cooked corn cut off the cob, unbuttered and unsalted, is fine in moderation. It is the cob alone that puts a dog in surgery. Signs appear over 12 to 72 hours — repeated vomiting, refusal to eat, lethargy, abdominal pain, no stool, dehydration, and in a late case collapse. The critical point is that by the time signs appear, hours have already been lost. If your dog got hold of a cob, call your veterinarian immediately even if the dog seems fine right now. Diagnosis needs radiographs or ultrasound, and removal usually means surgery. Do not induce vomiting at home: a hard cob coming back up can obstruct or tear the esophagus, and that decision belongs to a veterinarian. The ASPCA Animal Poison Control Center at 888-426-4435 is available while you head in. Practically, this is a summer cookout injury — corn on the cob at a Fourth of July barbecue, cobs in an open trash can or compost bin, cobs left on a low picnic table. Secure the trash before the guests arrive.
Frequently asked questions
- My dog chewed on a corn cob but seems fine. Can I wait?
- No. Cobs do not digest and lodge in the intestine, and signs typically take 12 to 72 hours to appear. Call your veterinarian now to arrange imaging rather than waiting for symptoms.
- Are corn kernels dangerous too?
- No. Plain cooked kernels cut off the cob, without butter or salt, are fine in moderation. The obstruction risk comes from the cob itself, not the corn.
- Should I make my dog throw up the cob?
- Do not induce vomiting. A hard cob can obstruct or tear the esophagus on the way back up. Let a veterinarian decide between induced emesis, endoscopy and surgery.