How 10 grams of dark chocolate hits a 3.5 kg cat
Cats lack the liver enzymes to metabolize theobromine efficiently, making them even more sensitive than dogs. That 10 grams of dark chocolate could contain 150-200 mg of theobromine—for a small cat, this approaches the toxic threshold much faster than in larger animals. Symptoms like twitching or rapid breathing may appear within an hour.
Unlike dogs, cats often hide symptoms until they're severe. Watch for subtle signs: ears twitching more than usual, refusing favorite treats, or hiding in unusual spots. Their smaller blood volume means toxins circulate faster, so don't rely on 'wait-and-see'—call while the chocolate is still in their stomach.
Why dark chocolate's percentage changes everything
Check the wrapper's cocoa percentage immediately—70% dark chocolate has nearly twice the theobromine of 50%. Ten grams of 85% dark could deliver a lethal dose to a cat under 4 kg. Baking chocolate is worse, but premium dark bars often rival its concentration.
If the cat licked melted chocolate off foil, note that too—aluminum foil isn't toxic but can cause cuts. The vet needs to know whether this was a single chunk or spread across multiple pieces, as absorption differs. Time matters more than amount now; even 30 minutes' delay changes treatment options.
The first hour: what happens inside your cat
Theobromine stimulates their central nervous system and heart simultaneously. Within 30-60 minutes, blood pressure rises and gut motility increases—you might hear gurgling sounds. Cats rarely vomit chocolate on their own, so don't expect natural expulsion. Their body temperature may climb dangerously high from muscle tremors.
Cardiac arrhythmias can start subtly with pupils dilating unevenly or sudden leaps without reason. These aren't normal 'zoomies'—it's the toxin disrupting nerve signals. Keep the cat in a dim, quiet room to reduce sensory input while you prepare to leave for the vet.
What the vet will ask about those 10 grams
They'll need the exact product name—some dark chocolates add coffee or guarana, doubling the caffeine content. Was it eaten all at once or over minutes? Cats nibbling slowly absorb less at once but prolong exposure. Note any pre-existing conditions like heart murmurs, which theobromine exacerbates.
Treatment may involve methocarbamol for muscle tremors and lipid IV therapy to bind fat-soluble toxins, but these require precise dosing for cats. Don't try home remedies—feline theobromine poisoning has a narrow treatment window, and 3.5 kg leaves no margin for error.
For a dose worked out against your pet's weight, use the Chocolate Toxicity Calculator.