Pet safety
Is Brussels sproutstoxic to cats & dogs?
Brassica oleracea var. gemmifera
Is brussels sprouts safe for cats and dogs?
Not entirely — brussels sprouts is mildly toxic to cats and dogs. It rarely causes serious harm, but chewing it triggers real discomfort, so it is best kept out of a pet's reach. This classification follows the ASPCA Toxic and Non-Toxic Plant List, the most widely used reference for companion-animal plant safety in the US and the standard most UK vets cite as well. ASPCA-equivalent risk: Brassica oleracea contains isothiocyanates; small amounts are safe but large quantities cause GI upset and gas in cats and dogs.
What happens if a pet eats brussels sprouts?
ASPCA-equivalent risk: Brassica oleracea contains isothiocyanates; small amounts are safe but large quantities cause GI upset and gas in cats and dogs. Signs usually appear soon after chewing rather than hours later. If you see drooling, pawing at the mouth, head-shaking, vomiting, loss of appetite, or unusual lethargy after your pet has had access to brussels sprouts, treat it as a suspected ingestion and act on the steps below.
What to do if your pet ate brussels sprouts
- Remove any plant material from your pet's mouth and move brussels sprouts out of reach.
- Note how much was eaten and when, and watch for drooling, vomiting, or lethargy.
- Do not induce vomiting unless a vet or poison-control specialist instructs you to.
- Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 and follow their advice.
- Bring a leaf or photo of brussels sprouts to the appointment so it can be treated correctly.
This page is general guidance, not veterinary advice. Pets vary, and a reaction may be to soil, fertiliser, or pesticide rather than the plant. If you are worried, always contact a vet or the ASPCA Animal Poison Control Center on (888) 426-4435 — do not wait for symptoms to worsen.
Pet-safe alternatives to brussels sprouts
Want the same look without the risk? These plants are listed as non-toxic to cats and dogs by the ASPCA and have similar care needs:
- Cucumber — non-toxic to cats and dogs (care guide)
- Lettuce — non-toxic to cats and dogs (care guide)
- Bean — non-toxic to cats and dogs (care guide)
- Pea — non-toxic to cats and dogs (care guide)
Brussels sprouts and pets — frequently asked questions
Is brussels sprouts toxic to cats?
Brussels sprouts (Brassica oleracea var. gemmifera) is mildly toxic to pets to cats according to the ASPCA. ASPCA-equivalent risk: Brassica oleracea contains isothiocyanates; small amounts are safe but large quantities cause GI upset and gas in cats and dogs. Keep it out of reach and contact your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 if your cat chews it.
Is brussels sprouts toxic to dogs?
The ASPCA lists the same toxicity status for dogs as for cats: Brussels sprouts is mildly toxic to pets. Dogs often chew more enthusiastically than cats, so a toxic plant like brussels sprouts is best removed from the floor and low shelves entirely.
What happens if my pet eats brussels sprouts?
ASPCA-equivalent risk: Brassica oleracea contains isothiocyanates; small amounts are safe but large quantities cause GI upset and gas in cats and dogs. Signs usually appear soon after chewing rather than hours later. If you see drooling, pawing at the mouth, head-shaking, vomiting, loss of appetite, or unusual lethargy after your pet has had access to brussels sprouts, treat it as a suspected ingestion and act on the steps below.
What should I do if my cat or dog ate brussels sprouts?
Stay calm. Remove any remaining plant material from your pet's mouth and take the plant away so they cannot eat more. Note roughly how much was eaten and when. Do not make your pet vomit unless a vet or poison-control specialist tells you to. Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 (a consultation fee may apply) and follow their advice. Bringing a photo or a leaf of brussels sprouts to the appointment helps the vet treat it correctly.
What are pet-safe alternatives to brussels sprouts?
If you want a similar look without the risk, good non-toxic swaps include cucumber, lettuce, bean, pea. All of these are listed as non-toxic to cats and dogs by the ASPCA, so they suit a home where pets have access to your plants.
Full brussels sprouts care
Pet-safety is one piece of the picture. For light, watering, soil, and troubleshooting, see the complete brussels sprouts care guide, or browse the full pet-safe plant library to check another plant before you buy it.