Why?
Mistletoe contains several toxic substances, including lectins and viscotoxins in European mistletoe and phoratoxins in American mistletoe. A small amount most often causes digestive upset: vomiting, diarrhea and drooling. Eating more can lead to weakness, a slow heart rate, low blood pressure or neurological signs, though such cases are rare.
How much?
No amount is safe. Hang mistletoe well out of reach, away from furniture your cat can climb, and pick up any fallen berries and leaves.
The risks
- Vomiting, diarrhea and drooling
- Belly pain
- Slow heart rate and low blood pressure with large amounts
- Weakness and wobbly walking
Your cat ate some: what now?
Call your vet or an animal poison control center without waiting for symptoms, and say how many berries or leaves your cat may have eaten. Keep a sprig of the plant to show them, and don't try to make your cat vomit.
Better options
For holiday decor, choose artificial mistletoe hung securely (watch out for fake berries, which can be swallowed) or fabric and wooden decorations.
Common questions
Is fake mistletoe safe for cats?
It isn't toxic, but the small plastic berries can be swallowed and cause choking or a blockage. Hang it out of reach, just like the real thing.
What Christmas plants are toxic to cats?
Lilies, often found in holiday bouquets, are the most dangerous; mistletoe, holly and amaryllis are also toxic. Poinsettias are only mildly irritating despite their reputation, but it's best to keep all of them out of reach.
This information is general and does not replace advice from a veterinarian. If your cat has swallowed something toxic, call your vet or an animal poison control center right away, without waiting for symptoms.