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If your dog ate field horsetail — do this now

  1. Take the plant away and clear any pieces from their mouth.
  2. Do not induce vomiting unless told to by a professional.
  3. Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 now.

Field Horsetail is mildly toxic to dogs (ASPCA).

Pet emergency

My dog ate Field Horsetail — what to do

Step by step

  1. Take field horsetail away and remove any plant material from your dog's mouth so they cannot eat more.
  2. Note roughly how much was eaten and when — this helps the vet judge the risk.
  3. Do NOT induce vomiting unless a vet or poison-control specialist tells you to.
  4. Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 (a consultation fee may apply) and follow their advice.
  5. Watch for drooling, pawing at the mouth, vomiting, loss of appetite, or lethargy, and bring a leaf or photo to the appointment.

This is general guidance, not veterinary advice. Pets vary, and a reaction may be to soil, fertiliser, or pesticide as well as the plant. When in doubt, call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435.

My dog ate field horsetail — FAQ

Is field horsetail poisonous to dogs?

Yes — the ASPCA lists Field Horsetail (Equisetum arvense) as mildly toxic to dogs. 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.

How serious is it if my dog ate field horsetail?

Field Horsetail is mildly toxic, so most dogs get short-lived mouth irritation, drooling, and vomiting rather than a life-threatening reaction. It is still worth a vet call to be safe, especially if your dog ate a lot or symptoms persist.

What symptoms should I watch for?

Signs usually appear soon after chewing: drooling, pawing at the mouth, vomiting, loss of appetite, or unusual lethargy. 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. Any worsening or persistent symptoms warrant an immediate vet visit.

Should I make my dog vomit?

No — do not induce vomiting unless a vet or the ASPCA Animal Poison Control Center specifically tells you to. The wrong action can make things worse. Call (888) 426-4435 and follow professional advice.

How do I stop this happening again?

Keep field horsetail well out of reach, or swap it for an ASPCA non-toxic plant — see the best dogs-safe plants list.

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