What an 8 kg dog faces from one mouldy slice
Your dog’s small size means even minor toxins can hit harder than in a larger animal, but the tiny mould spot limits the risk. The stomach upset you’re expecting—mild vomiting or loose stools—would likely start within 4-6 hours if it happens at all. Since mould spreads invisibly beyond visible spots, the actual ingested dose might be slightly higher than the speck you saw, though still unlikely to trigger severe reactions.
Watch for subtle signs like lip-licking, pacing, or a slightly tender belly—these often precede full vomiting. Diarrhea may take 12-24 hours to appear if the mould irritates the intestines. Hydration is key: offer ice chips if he refuses water, and skip food for 6 hours to let his stomach settle. One episode of vomiting isn’t an emergency, but three in an hour warrants a vet call.
Why the next 36 hours matter most
Mycotoxins from mould can sometimes cause delayed neurological effects, though this is rare with fruit moulds. Note any stumbling, excessive drooling, or dilated pupils—these would typically appear within a day. Your dog’s 8 kg body can’t dilute toxins as effectively as a bigger dog, so prolonged lethargy (sleeping through meals or walks) deserves attention even without vomiting.
The mould’s type matters: fruit moulds tend to be less aggressive than those on grains or nuts. If the pear was refrigerated, cold slows mould toxin production, making the spot less dangerous than one on room-temperature fruit. Still, trust behaviour over assumptions—if he’s acting oddly, don’t wait for ‘classic’ symptoms to escalate.
When to intervene beyond waiting
A single small mould spot rarely needs treatment, but exceptions exist. If your dog has prior liver issues or takes daily medications, his toxin-processing ability might be compromised—call your vet for advice even with mild signs. Similarly, brachycephalic breeds (like pugs) risk aspiration if they vomit frequently due to their airway shape.
Save a photo of the mould spot if possible—colour (blue-green vs. white) helps assess risk. Avoid inducing vomiting; mycotoxins can irritate the esophagus coming back up. Instead, offer bland food (boiled chicken, rice) after the initial waiting period. Probiotics like plain canned pumpkin (not pie filling) may soothe his gut, but skip dairy—lactose worsens diarrhea.
How this differs from eating fresh pear
Fresh pear flesh is safe for dogs in moderation—the fibre and sugar might cause soft stools, but not toxicity. Mould introduces unknowns: some strains produce tremorgenic toxins affecting the nervous system. Your dog’s one-time small exposure makes severe outcomes unlikely, but it’s not comparable to stealing a fresh slice.
Contrast his reaction to mould with typical pear overindulgence—fresh fruit causes sugar-fueled hyperactivity or gas, not the lethargy or twitching mould might. Rinsing fruit removes surface mould you can see, but not deep roots or toxins. For future safety, cut away mould with a 1-inch margin, though with dogs, it’s safer to discard questionable produce entirely.
The full verdict, portion guidance and serving notes are collected on the Pear food facts page.