A tablespoon is a massive dose for a 4 kg cat
Unlike dogs, cats lack the liver enzymes to process theobromine efficiently at any dose. That tablespoon of spread delivers a concentrated hit—think of it like a human drinking ten espresso shots at once. Even if your cat seems normal now, neurological damage can occur silently before symptoms show.
The other cat being unaffected doesn't reduce the urgency. Felines often hide illness, so don't assume the unaffected one is truly safe—double-check that no residue remains on paws or fur where grooming could spread it.
The unique risks of chocolate for cats
Dogs usually show chocolate toxicity through vomiting first, but cats may develop seizures or irregular breathing without warning. Their smaller lung capacity makes respiratory distress especially dangerous. The milk solids in hazelnut spread add lactose intolerance issues—diarrhea could dehydrate him while his body fights the chocolate.
Since cats groom meticulously, check between his toes and around his mouth for sticky residue he might ingest later. Use a damp cloth—don't risk him licking soap or cleaning chemicals off his coat during your attempt to help.
Why waiting for symptoms isn't an option
By the time you notice tremors or collapse, theobromine has likely already caused cellular damage. Cats metabolize toxins slower than dogs, so the crisis could unfold over 12-24 hours. That 'wait-and-see' approach people use for dogs becomes deadly here.
Your vet may administer IV lipids to bind the fat-soluble toxins—a treatment that works best when given preemptively. Unlike dogs, cats rarely vomit spontaneously after chocolate ingestion, so don't count on his body expelling the hazard naturally.
Preventing secondary exposure risks
While treating the affected cat, ensure the other one stays away not just from the spread but from any vomit or litter box contents. Theobromine can recycle through a cat's system via coprophagy (eating feces), creating a secondhand hazard.
Check any surfaces the spread contacted—cats walk everywhere, then lick their paws. A crumb the size of a sesame seed could be trouble if ingested later. Use pet-safe wipes, not human cleaning products that might add new toxins.
The full verdict, portion guidance and serving notes are collected on the Chocolate hazelnut spread food facts page.