Is Cocklebur Toxic to Cats?
Also known as: Clotbur, Rough Cocklebur, Large Cocklebur · Xanthium strumarium
What makes it toxic
Carboxyatractyloside, concentrated in the seeds and in the cotyledons of young seedlings. It blocks cellular energy production, driving acute liver damage and a dangerous drop in blood sugar.
Warning signs to watch for
Vomiting, lethargy, weakness and loss of appetite within hours, progressing to tremors, seizures, staggering, jaundice, low blood sugar and collapse as the liver fails.
What to do if your cat eats it
Emergency. Go to a vet immediately after any known ingestion of burs, seeds or seedlings — early decontamination, IV support and blood-sugar monitoring are the difference between recovery and liver failure.
Common questions
Are the burs dangerous or just the seeds?
The seed inside the bur carries the toxin, and sprouted seedlings are especially concentrated. The spiny bur itself also injures the mouth and gut, so no part is safe.
Where do cats meet cocklebur?
It grows in disturbed ground, ditches and field edges. Outdoor cats that hunt or forage near farms and vacant lots are the ones most likely to bring back a bur or chew a seedling.
More plants checked for cats
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.