There are several food types that should never be fed to a Cavalier King Charles Spaniel under any circumstances.
- Macadamia nuts
- Hops
- Yeast dough
- Other nuts, including almonds, walnuts, peanuts, and pecans
- Potato leaves, stems, skin, or any green parts
- Mustard seeds
- Chocolate
- Milk and dairy
- Apricot stems, leaves, and pits
- Peach stems, leaves, and pits
- Tomato plant
- Salt and salty snack foods
- Rhubarb
- Garlic
- Chamomile
- Coffee and caffeine
- Marijuana and edibles
- Avocado
- Xylitol
- Cherry steams, leaves, and pits
- Grapes and raisins
- Alcohol
- Citrus fruits
- Licorice
- Apple seeds and cores
- Onions and chives