Why the first vomit doesn't mean it's over
Your cat's initial vomiting doesn't guarantee the cob piece is out of her system. The 2-inch fragment could still be moving through her digestive tract, potentially causing irritation or blockage further down. Cats often vomit once from the initial irritation, then seem fine for hours before more serious signs develop as the cob fragment advances.
Since she's only 4 kg, even this small piece takes up significant space in her intestines. Watch closely for repeated vomiting attempts (dry heaving counts), sudden disinterest in food, or hunching as if her belly hurts. These may appear 8-12 hours later as the cob reaches narrower parts of her gut.
What makes cats hide blockages longer
Cats instinctively conceal discomfort, so you might not see obvious distress until the blockage is severe. A cat who seems "just quiet" but hasn't touched food in 12 hours is in more danger than one vomiting actively. Their small intestinal diameter means partial blockages can quickly become complete obstructions.
Check her litter box for normal stool production — if she's passing only small amounts or nothing at all despite eating previously, that's a red flag. Dehydration from repeated vomiting is also riskier for cats than dogs, so note any tacky gums or skin that tents when gently pinched.
When to stop waiting and act
If 12 hours pass with no further vomiting but she refuses even favorite treats, don't assume she's fine. Cats with blockages often stop vomiting because nothing can move past the obstruction, not because the problem resolved. This false improvement is why many owners delay vet visits until their cat is critically dehydrated.
For a 4 kg cat, waiting overnight is the absolute maximum — smaller bodies decompensate faster. If she vomits more than twice in 6 hours, can't keep water down, or shows belly pain when gently palpated (flinching, growling), seek emergency care immediately. X-rays may be needed to locate the cob fragment.
Why indoor monitoring matters now
Keeping her indoors lets you track every vomit episode and litter box visit. Outdoor cats often hide signs until collapse, and you might miss critical early warnings like frequent posture changes or excessive licking at the belly. Confinement also prevents her from eating grass or other items that could worsen a partial blockage.
Prepare a comfortable recovery space with water, a clean litter box, and no food until signs resolve (unless your vet advises otherwise). If she does pass the cob naturally, save it to show your vet — confirming expulsion is better than guessing.
The full verdict, portion guidance and serving notes are collected on the Corn on the cob food facts page.