How a 4kg cat processes half a cup of stew
Your cat's size works in their favor here—a 4kg body can handle this portion without issue. The celeriac in the stew was likely cut into small, well-cooked pieces that break down easily during digestion. Half a cup sounds like a lot to us, but for a cat's faster digestive tract, it's just a slightly larger than usual meal.
The chicken in the stew actually helps, as animal protein is easier for cats to process than plant matter. Watch their litter box for the next 24 hours; perfectly formed stools mean their system handled it well. Slightly softer stools tomorrow wouldn't be alarming unless it persists beyond two bowel movements.
Why timing matters with mixed-ingredient meals
Twenty minutes post-ingestion means the food is already moving from stomach to small intestine, past the point where vomiting would typically occur. This timing suggests their stomach tolerated the stew without immediate rejection. The absence of gagging or regurgitation in the first hour is a good sign.
However, some cats show delayed reactions to richer foods between 3-5 hours later when digestion is underway. A single episode of vomiting at this stage may just be their body adjusting, but call your vet if it happens more than twice or contains blood. Offer small sips of water to prevent dehydration.
The real risks hiding in homemade stews
Celeriac itself isn't the concern—it's the other common stew ingredients that could cause trouble. Onion and garlic are toxic even in small amounts, while excessive salt or fat can lead to electrolyte imbalances or pancreatitis. Assuming your stew avoided these, the celeriac is essentially just fiber and water for your cat.
If the stew contained wine, mushrooms, or certain herbs, those would warrant immediate vet attention. Barring those, what you're watching for isn't celeriac toxicity but rich-food intolerance: slight lethargy, a temporarily decreased appetite, or one loose stool. These should resolve within a day.
When to relax about dietary indiscretion
By the 12-hour mark with no symptoms, you can stop monitoring so closely. Cats process small amounts of safe vegetables within this timeframe. Their normal grooming habits, interest in play, and steady drinking confirm they're unaffected.
For future meals, remember that cats lack the enzymes to derive much nutrition from vegetables. While this incident was harmless, their ideal diet remains meat-based. If they develop a taste for stew, consider adding a teaspoon of plain boiled chicken to their regular food instead.
The full verdict, portion guidance and serving notes are collected on the Celeriac food facts page.