Why one raw floret matters for a 4 kg cat
A single raw broccoli floret represents a larger proportional intake for a cat than for a dog of similar size. Cats lack certain digestive enzymes that help break down plant matter, making even small amounts potentially irritating. The 4 kg body weight means the isothiocyanates in that floret have more concentrated effects.
While not toxic, the raw state makes the floret harder to digest than if it were cooked. The rigid cell walls haven't been broken down by heat, so the fiber is more abrasive to the stomach lining. Watch for subtle signs like lip-licking or overgrooming that might indicate nausea.
The first 12 hours after ingestion
Most reactions to a small amount of raw broccoli will appear within this window. Mild gas might cause your cat to shift positions more frequently or avoid being picked up around the abdomen. The litter box will tell you more—look for looser stools or more frequent attempts to defecate.
Because cats are masters at hiding discomfort, observe their normal routines. Any deviation—like skipping a meal, hiding more than usual, or vocalizing when touched—could signal that the broccoli isn't sitting well. The unaffected cat provides a helpful baseline for comparison.
When vomiting changes the situation
A single episode of vomiting up the floret might actually resolve the issue. But repeated vomiting, especially if nothing comes up, suggests more significant irritation. Dry heaving or producing only foam means the stomach is still trying to expel something.
For a 4 kg cat, more than two vomiting episodes in six hours warrants a call to the vet. Smaller animals dehydrate quickly, and the electrolytes lost through vomiting can cause secondary issues. If you see the vomit contains bile (yellow fluid) or blood, don't wait—seek help immediately.
Preventing future broccoli theft
Cats that succeed in stealing human food once will try again. Your broccoli-eating cat has now identified this as a potential snack, while the other may follow suit. Store broccoli in sealed containers or the refrigerator's crisper drawer where paws can't reach.
When preparing broccoli, immediately dispose of trimmed stems and florets in a lidded trash can. Cats can be attracted to the sulfurous smell of raw cruciferous vegetables, mistaking it for meatiness. A childproof latch on the trash cabinet adds an extra layer of security.
The full verdict, portion guidance and serving notes are collected on the Broccoli food facts page.