Is Lambkill Toxic to Dogs and Cats? (2026)
Kalmia augustifolia
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Quick facts
| Toxic to dogs | Yes |
|---|---|
| Toxic to cats | Yes |
| Toxic to horses | Yes |
| Toxic component | Grayanotoxins |
| Onset of symptoms | Within a few hours |
| Indoor / outdoor | outdoor |
If your pet ate this plant
Both lines are staffed 24/7. A consultation fee applies to each. Do not wait for symptoms to appear before calling.
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Symptoms in dogs
- Drooling
- Vomiting
- Weakness
- Abnormal heart rate
- Collapse
Symptoms in cats
- Drooling
- Vomiting
- Weakness
- Abnormal heart rhythm
Symptoms in horses
- Colic
- Weakness
- Abnormal heart rhythm
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What to do
Treat as an emergency — grayanotoxins affect heart rhythm and can progress quickly even if the pet seems fine initially.
Toxic component and mechanism
The toxic component in Lambkill is grayanotoxins.
What makes this plant different
Lambkill's name comes directly from historical livestock deaths, and its grayanotoxin mechanism is identical to Azalea and Mountain Laurel — all three Ericaceae relatives carry the same disproportionate cardiac danger for an unassuming-looking shrub.
Plant identification
- Scientific name
- Kalmia augustifolia
- Family
- Ericaceae
- Also known as
- Lambkill, Sheep Laurel
- Typically found
- outdoor
Pet-safe alternatives
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Related plants
Andromeda Japonica
Pieris japonica
Azalea
Rhododendron spp
Black Laurel
Leucothoe spp.
Bog Laurel
Kalmia poliifolia
Dog Hobble
Leucothoe sp.
Last verified: July 2, 2026 · Cross-referenced with ASPCA Animal Poison Control