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Is Winterberry 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, winterberry is toxic to dogs. Eating its red berries or leaves causes saponin-driven vomiting and diarrhea, usually mild to moderate.

Also known as: Ilex verticillata, Black Alder, Christmas Berry · Ilex verticillata

What makes it toxic

Saponins and related irritant glycosides densest in the berries. They irritate the gut lining and, in quantity, can cause drowsiness and depression.

Warning signs to watch for

Drooling, vomiting, diarrhea and abdominal discomfort within a few hours; larger berry meals may add lethargy and weakness.

What to do if your dog eats it

Take away the berries, let the dog drink and monitor for a few hours. Call your vet if vomiting or diarrhea persists or the dog seems listless.

Common questions

My dog ate dropped berries off a winterberry shrub — now what?

Count on some vomiting and diarrhea; offer water and watch. A call to the vet makes sense if a large quantity was eaten or symptoms last more than a day.

Do birds eating the berries mean they are safe?

No — winterberry fruit is a bird favorite but toxic to mammals, a classic case of species-specific tolerance.

More plants checked for dogs

Pothos☠️ ToxicYes, pothos is toxic to dogs. Chewing any part of the vine releases calcium oxalate crystals thaAloe Vera⚠️ Mildly ToxicAloe vera is mildly to moderately toxic to dogs. The skin and latex layer of the leaf contain coSpider Plant✅ Non-ToxicNo, spider plants are non-toxic to dogs. A dog that nibbles the arching leaves is not at risk ofEaster Lily⚠️ Mildly ToxicEaster lilies are only mildly toxic to dogs — they usually cause stomach upset, not the fatal kiSago Palm☠️ ToxicYes — sago palm is severely toxic to dogs, with a documented fatality rate around 50% when untreBoston 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.