Pet safety
Is Field Horsetailtoxic to cats & dogs?
Equisetum arvense
Quick verdict — at a glance
- Toxic to cats?
- Yes — mildly
- Toxic to dogs?
- Yes — mildly
- ASPCA classification
- Mildly toxic to pets · botanical name Equisetum arvense
Is field horsetail safe for cats and dogs?
Use caution. Field Horsetail is on the mildly-toxic side of the ASPCA list. Most ingestions are short-lived but unpleasant for the pet; the cost-free fix is a placement they can't reach. This classification follows the ASPCA Toxic and Non-Toxic Plant List, the most widely used reference for companion-animal plant safety in the US and the standard most UK vets cite as well. Equisetum arvense contains thiaminase and horse-toxic alkaloids (equisetine). Significant ingestion — especially by horses and livestock — causes thiamine deficiency, leading to neurological signs. For dogs and cats, mild gastrointestinal upset may occur with large ingestion. The ASPCA does not individually list E. arvense but veterinary sources treat the genus as moderately toxic. Herbal preparations for human use are regulated supplements; avoid long-term unsupervised human use (diuretic effect, potential kidney irritation). Always consult a qualified herbalist.
| Pet | Toxic? | Per ASPCA |
|---|---|---|
| Cats | Yes (mild) | Mildly toxic to pets |
| Dogs | Yes (mild) | Mildly toxic to pets |
What happens if a pet eats field horsetail?
Equisetum arvense contains thiaminase and horse-toxic alkaloids (equisetine). Significant ingestion — especially by horses and livestock — causes thiamine deficiency, leading to neurological signs. For dogs and cats, mild gastrointestinal upset may occur with large ingestion. The ASPCA does not individually list E. arvense but veterinary sources treat the genus as moderately toxic. Herbal preparations for human use are regulated supplements; avoid long-term unsupervised human use (diuretic effect, potential kidney irritation). Always consult a qualified herbalist. Signs usually appear soon after chewing rather than hours later. If you see drooling, pawing at the mouth, head-shaking, vomiting, loss of appetite, or unusual lethargy after your pet has had access to field horsetail, treat it as a suspected ingestion and act on the steps below.
What to do if your pet ate field horsetail
- Remove any plant material from your pet's mouth and move field horsetail out of reach.
- Note how much was eaten and when, and watch for drooling, vomiting, or lethargy.
- Do not induce vomiting unless a vet or poison-control specialist instructs you to.
- Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 and follow their advice.
- Bring a leaf or photo of field horsetail to the appointment so it can be treated correctly.
This page is general guidance, not veterinary advice. Pets vary, and a reaction may be to soil, fertiliser, or pesticide rather than the plant. If you are worried, always contact a vet or the ASPCA Animal Poison Control Center on (888) 426-4435 — do not wait for symptoms to worsen.
Pet-safe alternatives to field horsetail
Want the same look without the risk? These plants are listed as non-toxic to cats and dogs by the ASPCA and have similar care needs:
- Basil — non-toxic to cats and dogs (care guide)
- Herb garden — non-toxic to cats and dogs (care guide)
- Rosemary — non-toxic to cats and dogs (care guide)
- Thyme — non-toxic to cats and dogs (care guide)
Field Horsetail and pets — frequently asked questions
Is field horsetail toxic to cats?
Field Horsetail (Equisetum arvense) is mildly toxic to cats according to the ASPCA. Equisetum arvense contains thiaminase and horse-toxic alkaloids (equisetine). Significant ingestion — especially by horses and livestock — causes thiamine deficiency, leading to neurological signs. For dogs and cats, mild gastrointestinal upset may occur with large ingestion. The ASPCA does not individually list E. arvense but veterinary sources treat the genus as moderately toxic. Herbal preparations for human use are regulated supplements; avoid long-term unsupervised human use (diuretic effect, potential kidney irritation). Always consult a qualified herbalist. Keep it out of reach and contact your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 if your cat chews it.
Is field horsetail toxic to dogs?
Per the ASPCA, Field Horsetail (Equisetum arvense) is mildly toxic to dogs. Dogs often chew more enthusiastically than cats, so a toxic plant like field horsetail is best removed from the floor and low shelves entirely.
What happens if my pet eats field horsetail?
Equisetum arvense contains thiaminase and horse-toxic alkaloids (equisetine). Significant ingestion — especially by horses and livestock — causes thiamine deficiency, leading to neurological signs. For dogs and cats, mild gastrointestinal upset may occur with large ingestion. The ASPCA does not individually list E. arvense but veterinary sources treat the genus as moderately toxic. Herbal preparations for human use are regulated supplements; avoid long-term unsupervised human use (diuretic effect, potential kidney irritation). Always consult a qualified herbalist. Signs usually appear soon after chewing rather than hours later. If you see drooling, pawing at the mouth, head-shaking, vomiting, loss of appetite, or unusual lethargy after your pet has had access to field horsetail, treat it as a suspected ingestion and act on the steps below.
What should I do if my cat or dog ate field horsetail?
Stay calm. Remove any remaining plant material from your pet's mouth and take the plant away so they cannot eat more. Note roughly how much was eaten and when. Do not make your pet vomit unless a vet or poison-control specialist tells you to. Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 (a consultation fee may apply) and follow their advice. Bringing a photo or a leaf of field horsetail to the appointment helps the vet treat it correctly.
What are pet-safe alternatives to field horsetail?
If you want a similar look without the risk, good non-toxic swaps include basil, herb garden, rosemary, thyme. All of these are listed as non-toxic to cats and dogs by the ASPCA, so they suit a home where pets have access to your plants.
Full field horsetail care
Pet-safety is one piece of the picture. For light, watering, soil, and troubleshooting, see the complete field horsetail care guide, or browse the full pet-safe plant library to check another plant before you buy it.