Why a 4 kg cat’s small bite matters less than chewing
Cats lack the enzymes to digest plant cell walls, so celery passes through mostly unchanged. The 3-inch piece is only risky if your cat didn’t chew it—whole chunks may scrape the stomach lining. Listen for crunching sounds when she ate it; if you heard none, watch closer for discomfort signs.
Unlike dogs, cats rarely vomit from vegetable irritation alone unless they’re prone to hairballs. Her stomach may gurgle audibly for an hour as muscles work the fiber through. Offer a teaspoon of plain canned pumpkin (not pie filling) to help coat any sharp edges moving through her gut.
The two-hour window for mild stomach upset
If she’ll have any reaction, it’s usually within 120 minutes—the time it takes for her stomach to either accept or reject the celery. A single vomit episode containing grass or clear foam is normal. Abnormal would be multiple attempts, yellow bile, or undigested food from earlier meals mixed in.
Check her litter box tonight for celery strands in the stool—these mean it’s passing safely. No need to panic if you don’t see them; cats often digest plant matter more fully when stressed. Her poop may be slightly greener tomorrow from chlorophyll.
Why you might find hidden celery remnants later
Cats often spit out fibrous vegetable skins after extracting the juice. Search under furniture for pale, shredded bits—these are the tough outer strings her teeth filtered out. Finding them means she handled the celery appropriately and avoided swallowing the hardest parts.
If she drooled while chewing earlier, that was her saliva breaking down the cellulose. No drooling could mean she swallowed it too fast. Monitor her water intake tonight—cats with mild throat irritation may lap more frequently but take smaller sips.
When to suspect an unrelated issue
If she acts off beyond 24 hours—lethargic, hiding, or refusing favorite foods—the celery likely wasn’t the cause. Cats mask pain from urinary blockages or infections with similar signs. Note whether she’s still using the litter box normally; straining without results needs immediate vet attention regardless of celery history.
Her weight helps here—a 4 kg cat has enough body mass to process small vegetable pieces safely. Only call the vet if she vomits more than twice in a day, develops diarrhea with mucus, or stops grooming herself. These suggest an underlying condition the celery incidentally aggravated.
The full verdict, portion guidance and serving notes are collected on the Celery food facts page.