What to do if your pet ate it
Contact your vet or a poison line right away, report how much Mustard seeds was eaten and your pet's weight, and keep any packaging or leftovers. Do not induce vomiting unless your vet tells you to.
Signs to watch for
- Vomiting and diarrhoea
- Lethargy and weakness
- Loss of appetite
- Severe: tremors, breathing trouble, collapse
If your pet shows vomiting, lethargy or any unusual behaviour after eating Mustard seeds, go to the nearest emergency vet immediately.
Dogs and cats carry the same rating (Do not feed), so the notes below hold for either pet.
Other foods that are toxic or dangerous
The full A–Z food list groups every food by verdict for each species.
Why these cautions matter
Stone-fruit pits and some seeds release cyanide when crushed, and quite apart from that they are a choking and blockage hazard.
Frequently asked questions
Can cats eat Mustard seeds?
NO — do not feed. Seeds and powder are toxic — they can cause gastroenteritis; high doses may damage the heart.
What if my cat already ate Mustard seeds?
Call your vet or a poison line now with the amount of Mustard seeds eaten and your cat's weight, and do not induce vomiting unless a vet tells you to. If Mustard seeds was eaten and you then see vomiting, lethargy, tremors or breathing changes, go straight to the nearest emergency clinic.
Is there a safe amount of Mustard seeds for cats?
There is no accepted safe dose of Mustard seeds for cats; it is classed as toxic or dangerous, and reactions vary with the individual animal, so it is not something to feed at any amount.
How often can cats have Mustard seeds?
Mustard seeds is not something to feed at any interval; it stays off the menu entirely.
What are safer treats than Mustard seeds for cats?
Pick from the safe list instead — Halibut or Tilapia carry none of the risk that Mustard seeds does, and they work better as an everyday treat.