Can Cats Eat Mustard? Why Mustard Is Toxic to Cats

Mustard is a common condiment found in most kitchens, but can cats eat mustard? No — mustard is toxic to cats and should be kept well away from them. Here's what every cat owner needs to know.

Is Mustard Toxic to Cats?

Yes. Mustard seeds and mustard plants are listed as toxic to cats by the ASPCA. Mustard contains glucosinolates — compounds that break down into irritating and toxic substances when ingested. Both the seeds and prepared mustard condiment are harmful.

Symptoms of Mustard Toxicity in Cats

If a cat ingests mustard, symptoms may include:

• Vomiting and diarrhea
• Gastrointestinal irritation and pain
• Excessive drooling
• Lethargy and weakness
• Loss of appetite

Interestingly, mustard has historically been used to induce vomiting in dogs — but this is not a safe or recommended practice for cats, and the toxic compounds in mustard make it dangerous regardless.

What Makes Prepared Mustard Even More Dangerous?

Beyond the mustard seeds themselves, prepared mustard condiments often contain additional harmful ingredients:

• Vinegar — highly acidic and irritating to cats
• Salt — excess sodium is toxic to cats
• Garlic or onion powder — present in some mustard varieties, both highly toxic to cats
• Turmeric and spices — can cause additional digestive irritation

What to Do If Your Cat Eats Mustard

Contact your veterinarian promptly. Even a small amount of mustard can cause significant gastrointestinal distress. Ensure your cat has access to fresh water and monitor for symptoms. Keep a pet first aid kit on hand:

👉 EVERLIT Pet Medic First Aid Kit (95 Pcs) — vet-approved emergency supplies for cats and dogs.

Safe Treat Alternatives

👉 Vital Essentials Freeze Dried Chicken Hearts Cat Treats — single ingredient, no condiments, pure protein.
👉 Temptations Feline Favorites Variety Pack — crunchy and soft treats cats love, completely condiment-free.

Final Thoughts

Mustard is toxic to cats — both the seeds and prepared condiment. Keep all mustard products away from your cat and contact your vet if ingestion occurs. Stick to treats that are made specifically for felines.

This article is for informational purposes only. Always consult a licensed veterinarian for medical advice specific to your pet.