Why 30g hits a 4kg cat harder than a dog
Theobromine, the toxic component in chocolate, builds up in a cat's system longer than in dogs because their liver processes it slower. For a 4kg cat, 30g of dark chocolate is roughly equivalent to a 60kg human eating two full bars—enough to cause severe symptoms. Their smaller body size means even small amounts concentrate quickly in their bloodstream.
Watch for early signs like pacing or excessive vocalizing, which may appear within two hours. Later stages involve muscle tremors that look like shivering but don't stop when they're warm. Dark chocolate's high cocoa content makes this urgent—don't wait for symptoms to escalate.
Critical first six hours after ingestion
Timing matters because theobromine absorption peaks around 3-4 hours post-ingestion. If your cat ate this within the last hour, veterinary intervention can still prevent most toxins from entering their system. Bring the wrapper—the cocoa percentage helps calculate risk.
At home, don't offer food or milk (it doesn't neutralize toxins). Note any unusual behavior like refusing favorite treats or hiding more than usual. These subtle changes often precede obvious clinical signs in cats.
How feline symptoms differ from dogs
Cats rarely vomit from chocolate like dogs do—their warning signs are quieter. You might notice dilated pupils that don't adjust to light or a heart rate over 200 beats per minute (feel their chest behind the left elbow). Their breathing may become rapid even while resting.
Unlike dogs who get hyperactive, cats often alternate between agitation and lethargy. They may stare blankly or seem uncoordinated when jumping. These neurological symptoms require immediate veterinary attention.
Longer-term risks even after treatment
If untreated, theobromine can cause irregular heart rhythms that persist for up to 72 hours. A 4kg cat's small cardiovascular system is especially vulnerable to these arrhythmias. Hospitalization may include IV fluids to protect their kidneys from toxin breakdown products.
Aftercare involves monitoring litter box habits—straining or bloody urine suggests bladder irritation from metabolic byproducts. Keep them in a dim, quiet room; light and noise can worsen their neurological stress during recovery.
For a dose worked out against your pet's weight, use the Chocolate Toxicity Calculator.