Is Groundsel Toxic to Dogs?

☠️ ToxicSeverity: Moderate

✅ Cross-checked against veterinary poison-control guidance · Oct 2026 audit

⚠️ Educational info only. If your pet just chewed something and looks unwell, skip the reading and call your vet or Pet Poison Helpline (US): (855) 764-7661.

Yes, groundsel is toxic to dogs. Its pyrrolizidine alkaloids irritate the gut and, with repeated eating, silently damage the liver.

Also known as: Old-Man-In-The-Spring, Ragwort (common), Senecio vulgaris · Senecio vulgaris

What makes it toxic

Pyrrolizidine alkaloids throughout the plant. They are metabolized in the liver into reactive compounds that accumulate damage across exposures — the chronic risk exceeds the acute one.

Warning signs to watch for

Short-term: drooling, vomiting and diarrhea. Chronic: weight loss, jaundice, weakness, neurological signs from liver failure and sensitivity of light-colored skin to sun.

What to do if your dog eats it

Pull the plant from pet areas and bag it. After a single ingestion, watch for GI signs; after repeated grazing, ask your vet for liver function tests even if the dog looks fine.

Common questions

Can groundsel really cause liver failure in a dog?

Liver injury from pyrrolizidine alkaloids is documented mainly in grazing livestock that eat it repeatedly; dogs face it only through chronic access. Still, remove the weed rather than risk it.

Is groundsel the same as tansy ragwort?

They are close Senecio/Jacobaea relatives sharing the same alkaloids. Both are noxious weeds worth eliminating from yards with pets.

More plants checked for dogs

Pothos☠️ ToxicYes, pothos is toxic to dogs. Chewing any part of the vine releases calcium oxalate crystals tha Aloe Vera⚠️ Mildly ToxicAloe vera is mildly to moderately toxic to dogs. The skin and latex layer of the leaf contain co Spider Plant✅ Non-ToxicNo, spider plants are non-toxic to dogs. A dog that nibbles the arching leaves is not at risk of Easter Lily⚠️ Mildly ToxicEaster lilies are only mildly toxic to dogs — they usually cause stomach upset, not the fatal ki Sago Palm☠️ ToxicYes — sago palm is severely toxic to dogs, with a documented fatality rate around 50% when untre Boston Fern✅ Non-ToxicNo, Boston ferns are non-toxic to dogs. Chewing a frond will not poison your dog.

This page is general educational information, not a substitute for professional veterinary advice. Every pet is different — if your animal ate something concerning, contact your veterinarian or a pet poison hotline right away. Checking what your pet can eat? Visit our sister site SafeOrToxic.