There are several food types that should never be fed to a jack russell terrier under any circumstances.

- Alcohol
- Chocolate, Coffee and Caffeine
- Avocado
- Citrus
- Grapes and Raisins

- Coconut and Coconut Oil
- Macadamia Nuts
- Nuts
- Milk and Dairy

- Onions
- Garlic
- Chives

- Salt and Salty Snack Foods
- Xylitol
- Yeast Dough

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