Can cats eat mustard?
Not recommendedNo, mustard should be kept away from cats, the seeds upset their stomach and the salt and allium seasoning are a bigger problem in a small body.
Reviewed by the Webvet Veterinarian Team · Last reviewed June 26, 2026
Why
Cats get no nutritional benefit from mustard. Mustard seed can irritate the gastrointestinal tract, and onion or garlic powder in some prepared mustards can oxidatively damage feline red blood cells. Cats are more susceptible than dogs to Allium toxicosis, and concentrated powders make label-based dose estimates unreliable.
Risks to watch for
- Mustard seed commonly triggers vomiting and diarrhea
- Onion or garlic powder can damage red blood cells and cause anemia
- Salt load is significant in a small body and causes dehydration
What to do if your cat ate mustard
Check the exact ingredient list and contact your veterinarian or Pet Poison Helpline (855-764-7661) with the product, estimated amount and time, your cat's weight and history, and any symptoms.
Mustard nutrition
- Calories
- ≈60 kcal / 100g in one representative USDA entry
- Sodium
- ≈1100mg / 100g in one representative USDA entry
- Key nutrients
- Nothing meaningful for pets
Safe alternatives
More pantry & other for cats
Frequently asked questions
Can cats eat mustard?
No, mustard should be kept away from cats, the seeds upset their stomach and the salt and allium seasoning are a bigger problem in a small body.
What happens if a cat eats mustard?
Cats get no nutritional benefit from mustard. Mustard seed can irritate the gastrointestinal tract, and onion or garlic powder in some prepared mustards can oxidatively damage feline red blood cells. Cats are more susceptible than dogs to Allium toxicosis, and concentrated powders make label-based dose estimates unreliable. Watch for: Mustard seed commonly triggers vomiting and diarrhea; Onion or garlic powder can damage red blood cells and cause anemia; Salt load is significant in a small body and causes dehydration.
What should I do if my cat ate mustard?
Check the exact ingredient list and contact your veterinarian or Pet Poison Helpline (855-764-7661) with the product, estimated amount and time, your cat's weight and history, and any symptoms.
Sources
Reviewed by the Webvet Veterinarian Team
General guidance based on credible veterinary sources — not a diagnosis or a substitute for your veterinarian. If your pet ate something toxic or is unwell, contact your vet or a pet poison line right away.