How much mustard for your cat?
Most guides say "a few pieces". Enter your cat's weight and get the actual daily ceiling, worked out from mustard's calories and the 10%-of-daily-calories treat rule vets use.
Assumes a healthy, neutered adult at a stable weight, and that this is their only treat that day. Puppies, pregnant, very active or unwell pets need different amounts — ask your vet.
Why this verdict for cats
Mustard seeds can irritate a cat digestive system. Keep it away.
🍽️ Feeding it safely?
Frequently asked questions
Can cats eat mustard?
In moderation. Mustard seeds can irritate a cat digestive system. Keep it away.
How much mustard can cats have?
Recommended: Avoid. When in doubt, ask your vet.
Is mustard safe for dogs too?
Verdicts can differ between species. See the dog answer for mustard →
More pantry & snack foods for cats
By the CanMyPet Editorial Team · Reviewed against ASPCA Animal Poison Control, the American Kennel Club (AKC) and Pet Poison Helpline · Last updated June 22, 2026.
Sources
- ASPCA — People Foods to Avoid Feeding Your Pets
- American Kennel Club — Dog Nutrition
- Pet Poison Helpline — Poison List