Why 20 kernels matter for a 5 kg cat
While a couple of stray kernels wouldn't raise concern, twenty is enough volume to potentially irritate your cat's digestive tract. The main issue isn't toxicity — sweetcorn isn't poisonous to cats — but rather how that amount might overwhelm her system. Cats lack the enzymes to properly break down plant matter, so this much corn could lead to some gastrointestinal grumbling.
Watch for subtle signs like excessive lip-licking or pacing, which often precede vomiting in cats. The kernels may pass through undigested, appearing whole in her stool over the next day or two. What you don't want to see is repeated dry heaving without producing anything, as that could suggest the kernels are stuck.
The cob check you can't skip
Before focusing on the kernels, confirm whether any cob fragments are missing. Run your finger along the edge of the cob — if there are fresh breaks or sharp edges, she might have ingested some. Unlike soft kernels, cob pieces are rigid and fibrous, posing a real intestinal obstruction risk, especially for a cat her size.
Signs of cob trouble wouldn't appear immediately but would escalate over 12-24 hours: refusal to eat, lethargy, or painful meowing when picked up. If you find evidence of cob ingestion, don't wait for symptoms — that's an immediate vet visit. For now, gather any remaining cob pieces to help the vet assess what's missing.
Handling the next few hours
With just kernels involved, your main task is observation. Don't try to induce vomiting or give any home remedies, as these often cause more harm. Instead, remove all food for 4-6 hours to let her stomach settle while keeping fresh water available. This brief fasting period helps her system decide whether to reject the corn naturally.
When you reintroduce food, offer a tablespoon of her regular wet food first. If she keeps that down, you can resume normal feeding. Some cats experience softer stools after eating corn, which isn't an emergency unless it persists beyond two bowel movements or contains blood. What would warrant an urgent call? Three vomiting episodes in an hour or visible distress.
When to relax versus react
You can breathe easier if 6-8 hours pass with no symptoms beyond maybe one isolated vomit containing corn. At that point, the worst is likely over, though you might find undigested kernels in her litter box tomorrow. Cats typically process non-toxic foreign matter within 48 hours when no complications arise.
However, any new behavior changes — like hiding more than usual, refusing favorite treats, or adopting that telltale 'loaf' position with tense shoulders — mean it's time for professional evaluation. Your cat's small body size makes even mild dehydration from vomiting riskier than it would be for a larger animal. When in doubt, a quick vet check beats guessing.
The full verdict, portion guidance and serving notes are collected on the Sweetcorn kernels food facts page.