Quick Answer

Grapes (Seedless Red/Green) is NOT safe for your Cats. While cats are less likely to eat grapes than dogs, grape ingestion is equally dangerous and can cause sudden kidney failure in felines. The unknown nephrotoxic compound damages renal tubules, leading to vomiting, anorexia, and oliguric renal shutdown. Even a single grape can be lethal, and raisins—concentrated dried grapes—pose an even greater risk. All grape-based products must be kept away from cats, and any accidental consumption should be treated as an immediate medical emergency.