How mould changes the risk level
Mould produces mycotoxins that are unpredictable—some cats react violently to trace amounts, while others shrug it off. Your 6 kg cat’s size helps dilute the toxin load, but mould spores can inflame the stomach lining faster than fresh fruit would. The segment being left out overnight let bacteria multiply too, adding another layer of risk.
Location matters: mould growing under a fridge or in damp corners tends to be more aggressive than surface mould on fruit. If she dragged the segment from a hidden spot, the toxin concentration could be higher. Watch for twitching whiskers or drooling, which sometimes precede vomiting.
The next 12 hours are critical
Most mould reactions start with vomiting within 2–6 hours as the body tries to purge the toxins. Diarrhea may follow if some toxins slip past the stomach. Time is on your side if she’s still acting normal after 12 hours—the worst has likely passed.
However, lethargy or refusing her next meal suggests the toxins are affecting her systemically, not just irritating the gut. Press gently on her belly—if she flinches or meows, the inflammation may need vet attention. A 6 kg cat can decline quickly with certain mycotoxins, so don’t wait if her energy drops.
Why water intake matters now
Mould toxins can dehydrate her even before vomiting starts. Offer fresh water in a clean bowl (no standing water, which may harbour more spores). If she laps eagerly but then walks away, she might feel nauseous. Ice cubes can be a gentler way to get fluids in.
Check her gums—if they’re pale or tacky instead of pink and moist, dehydration is setting in. Skin tenting (when you gently pinch her scruff and it doesn’t snap back) is another red flag. For a mould exposure, these signs mean call the vet now, don’t wait for vomiting.
Preventing future mould scavenging
Cats are drawn to mould’s musty smell—it mimics some earthy compounds in their prey. After this scare, do a kitchen sweep: check under appliances, inside cabinet corners, and behind trash bins for forgotten food. A 6 kg cat can squeeze into surprising spaces.
If she’s a repeat offender, consider keeping fruit in the fridge and wiping counters with vinegar (cats hate the smell). Watch for any behavioural changes like increased vocalisation or hiding—it could mean the mould affected her neurologically, which is always an emergency.
The full verdict, portion guidance and serving notes are collected on the Mandarin food facts page.