How much mustard for your dog?
Most guides say "a few pieces". Enter your dog'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 dogs
Prepared mustard and mustard seeds can irritate the stomach and cause vomiting. Best avoided.
🍽️ Feeding it safely?
Frequently asked questions
Can dogs eat mustard?
In moderation. Prepared mustard and mustard seeds can irritate the stomach and cause vomiting. Best avoided.
How much mustard can dogs have?
Recommended: Best avoided. When in doubt, ask your vet.
Is mustard safe for cats too?
Verdicts can differ between species. See the cat answer for mustard →
More pantry & snack foods for dogs
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