List of items that are highly toxic to Cats:

  • Grapes & Raisins
  • Lillies
  • Paracetemol
  • Chocolate
  • Onion ‘family’: onions, garlic, leeks, scallions, shallots, and chives
  • Citrus fruits, and citrus fruit trees: leaves, stems, etc.
  • Xylitol sweetener
  • Alcohol
  • Nuts, especially Macademia nuts

Sources: