Why 10 grams is a tipping point for a 3.5 kg cat
Dark chocolate’s high cocoa content means just two small squares (10g) can contain over 100 mg of theobromine—enough to endanger a cat your size. Unlike dogs, cats’ sensitivity isn’t widely known, so owners often underestimate tiny amounts. Their slower metabolism turns what seems minor into a sustained assault on their system.
At this dose, expect symptoms within an hour—restlessness, vocalizing, or excessive grooming as the toxin stimulates their nerves. These aren’t just discomfort; they signal neurological distress.
How feline size turns a taste into a crisis
A 5 kg cat might tolerate this amount with monitoring, but at 3.5 kg, your cat’s margin for error vanishes. Theobromine toxicity isn’t linear—small reductions in body weight disproportionately increase risk. What a larger cat could process might overwhelm your pet’s liver capacity.
Cats also groom compulsively, so “just licking” may mean more ingested than you saw. Check their paws and face for residue—absorption through mucous membranes adds to the dose.
The hidden timeline of chocolate poisoning
Initial signs like hyperactivity or twitching often appear within two hours, but the real danger peaks later. Theobromine’s half-life in cats exceeds 17 hours—meaning symptoms can escalate long after ingestion. Even if they seem stable now, cardiac effects like irregular heartbeat may develop silently.
Don’t rely on vomiting as a gauge; cats may not purge effectively. Their natural stoicism masks suffering until systems are severely compromised.
Why dark chocolate demands faster action than milk
Milk chocolate’s lower cocoa content (10-20%) makes licking a wrapper low-risk, but dark varieties (50-90% cocoa) concentrate the threat. Ten grams of milk chocolate might contain 20 mg theobromine—dark can pack five times that. For perspective, 20 mg/kg is toxic for cats; your pet hit that threshold with this single exposure.
The sugar in milk chocolate also slows absorption, while dark’s purity delivers theobromine faster. This isn’t a “wait-and-see” scenario—it’s a race against metabolic processing.
For a dose worked out against your pet's weight, use the Chocolate Toxicity Calculator.