Cats are curious by nature—and that often includes poking their noses into human food. But just because your feline is interested in what’s on your plate doesn’t mean it’s safe for them. One common condiment that raises questions is mustard.
In this vet-verified article, we’ll answer:
- Can cats eat mustard safely?
- What ingredients in mustard are dangerous for cats?
- What to do if your cat accidentally eats mustard
- Safer alternatives and how to keep curious paws out of condiments
Can Cats Eat Mustard?
No, cats should not eat mustard. While a small lick may not cause immediate harm, mustard is not safe or healthy for cats and can lead to digestive upset or more serious issues, depending on the amount consumed.
Why Is Mustard Bad for Cats?
The problem with mustard lies in what it’s made of. Most types include ingredients that are either irritating or toxic to cats.
Harmful Ingredients Often Found in Mustard:
- Mustard seeds: Can cause gastrointestinal inflammation in cats (mustard seed poisoning).
- Vinegar: Highly acidic and irritating to a cat’s stomach lining.
- Garlic or onion powder: Common additives that are toxic to cats even in small amounts.
- Salt and spices: High sodium levels and spices like paprika or turmeric can cause dehydration or GI distress.
- Sugar or artificial sweeteners: Not toxic, but contribute no benefit and can upset a cat’s metabolism.
Signs of Mustard Toxicity or Upset in Cats
If your cat licks or eats mustard, monitor them for the following symptoms:
- Vomiting
- Diarrhea
- Drooling
- Lethargy
- Abdominal pain
- Loss of appetite
- Excessive thirst or urination (if salt intake was high)
Important: If your cat consumed a large amount of mustard—or any containing garlic or onion—contact your veterinarian immediately.
What to Do if Your Cat Eats Mustard
- Don’t panic. A small lick is unlikely to be dangerous but still monitor for symptoms.
- Check the ingredients. Look for onion, garlic, or xylitol (rare but serious).
- Call your vet if your cat ate more than a small taste, especially if symptoms appear.
Safe Alternatives & Precautions
While cats don’t need condiments, here are a few safe treats they can enjoy instead:
- Plain cooked chicken or turkey (no spices or sauces)
- A bit of canned tuna (in water, not oil or brine)
- Commercial cat treats or lickable treats like Churu
- Freeze-dried meat treats
Prevent access by:
- Keeping mustard and sauces out of reach
- Storing leftover plates immediately
- Discouraging begging behavior with redirection and training
Frequently Asked Questions (FAQs)
Q1: What happens if my cat licks a little mustard?
A small lick may only cause mild stomach upset—but watch for signs like vomiting or diarrhea. If symptoms persist, contact your vet.
Q2: Are mustard seeds toxic to cats?
Yes. Mustard seeds can cause gastroenteritis (inflammation of the stomach and intestines) and should always be avoided.
Q3: Is Dijon or honey mustard worse?
Yes. Dijon mustard contains stronger spices and honey mustard includes added sugars. Both are even more unsuitable for cats than plain yellow mustard.
Q4: Can mustard kill a cat?
While rare, large amounts of mustard—especially with toxic ingredients like garlic—can lead to severe reactions and require urgent veterinary care.
Final Thoughts
Cats should not eat mustard. Even small amounts can cause gastrointestinal issues, and some formulations include toxic ingredients like garlic or mustard seeds. If your cat sneaks a lick, monitor them closely—but better yet, keep mustard-covered foods out of reach and offer safe cat treats instead.