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If your cat ate brussels sprouts — do this now

  1. Take the plant away and clear any pieces from their mouth.
  2. Do not induce vomiting unless told to by a professional.
  3. Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 now.

Brussels sprouts is mildly toxic to cats (ASPCA).

Pet emergency

My cat ate Brussels sprouts — what to do

Step by step

  1. Take brussels sprouts away and remove any plant material from your cat's mouth so they cannot eat more.
  2. Note roughly how much was eaten and when — this helps the vet judge the risk.
  3. Do NOT induce vomiting unless a vet or poison-control specialist tells you to.
  4. Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 (a consultation fee may apply) and follow their advice.
  5. Watch for drooling, pawing at the mouth, vomiting, loss of appetite, or lethargy, and bring a leaf or photo to the appointment.

This is general guidance, not veterinary advice. Pets vary, and a reaction may be to soil, fertiliser, or pesticide as well as the plant. When in doubt, call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435.

My cat ate brussels sprouts — FAQ

Is brussels sprouts poisonous to cats?

Yes — the ASPCA lists Brussels sprouts (Brassica oleracea var. gemmifera) as mildly toxic to cats. ASPCA-equivalent risk: Brassica oleracea contains isothiocyanates; small amounts are safe but large quantities cause GI upset and gas in cats and dogs.

How serious is it if my cat ate brussels sprouts?

Brussels sprouts is mildly toxic, so most cats get short-lived mouth irritation, drooling, and vomiting rather than a life-threatening reaction. It is still worth a vet call to be safe, especially if your cat ate a lot or symptoms persist.

What symptoms should I watch for?

Signs usually appear soon after chewing: drooling, pawing at the mouth, vomiting, loss of appetite, or unusual lethargy. ASPCA-equivalent risk: Brassica oleracea contains isothiocyanates; small amounts are safe but large quantities cause GI upset and gas in cats and dogs. Any worsening or persistent symptoms warrant an immediate vet visit.

Should I make my cat vomit?

No — do not induce vomiting unless a vet or the ASPCA Animal Poison Control Center specifically tells you to. The wrong action can make things worse. Call (888) 426-4435 and follow professional advice.

How do I stop this happening again?

Keep brussels sprouts well out of reach, or swap it for an ASPCA non-toxic plant — see the best cats-safe plants list.

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