Toad Poisoning: Which Toads Matter, and What to Do
Most toads only make a dog drool. Cane toads and Colorado river toads can kill. Where they live, the signs, and why vets say not to make your dog vomit.
Written by thecanineledger
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If your dog has bitten, licked or mouthed a toad and you live where cane toads or Colorado river toads are found, phone your vet or emergency clinic now and go. Don’t wait for signs. Go now anywhere if your dog has a seizure, collapses, struggles to breathe, or its gums turn blue or grey. Don’t make your dog vomit.
Our note: The “go now, don’t wait for signs” rule for the two dangerous toads is ours. The sources say signs start immediately and that early mouth flushing is recommended.
In a 2026 study of 208 dogs brought to Arizona emergency hospitals after contact with the Colorado river toad, the outlook was excellent, with “206 of 208 (99%) dogs surviving to discharge” (Wilkins et al., Journal of the American Veterinary Medical Association 2026, abstract). A 2016 review of the cane toad says exposure “can carry a high fatality rate without early and appropriate treatment” (Johnnides et al., Journal of the American Animal Hospital Association 2016, abstract).
While those two findings sound opposite, they fit together. The Arizona dogs were treated fast, in emergency hospitals. This page explains which toads matter, what the signs are, and what to do on the way to the vet.
1. Which toads matter
All toads make toxin, but most aren’t dangerous. The Merck Veterinary Manual says that “serious reaction or death generally occurs only after exposure to large toads such as Rhinella marina (marine toad) or Incilius alvarius (Colorado river toad)” (Merck Veterinary Manual, professional version, reviewed July 2026).
The marine or cane toad. In the US, it’s “an introduced species that is established in Florida, Hawaii, and Texas.” It’s also the cane toad in Australia, “where its range extends across the northeastern half of the continent.”
The Colorado river toad is “found in the southwestern US and northern Mexico”.
Europe’s common toad. A 2024 review of animal toxins in Europe lists the common toad among the commonest causes of poisoning in domestic animals. But it also says that “Information about toad venom poisoning in domestic animals in Europe is scarce, with only a few case reports available in the literature” (Nagy et al., Toxins 2024). One of those reports was a puppy that died.
Small toads can still matter. The European review notes that “smaller toad species are dangerous if multiple individuals are ingested”. Merck adds that dogs with heart disease can react more severely, “especially if the toad is ingested.”
Our note: We give the US and Australian ranges from Merck and name Europe’s common toad from the 2024 review. We haven’t checked toad species in Canada, the UK or elsewhere.
2. The signs
They start straight away. Merck explains that local effects “are immediate, because the toxin is extremely irritating.” They include “profuse, sometimes frothy salivation”, “vigorous head shaking, pawing at the mouth, and retching”.
With the dangerous toads, it goes further. “With Rhinella marina or Incillus alvarius, cardiac arrhythmias, dyspnea, cyanosis, and seizures are characteristic.” That means abnormal heart rhythms, laboured breathing, and a blue tinge to the gums. Merck adds: “Cardiac and CNS involvement can be life-threatening.” CNS is the brain and nervous system.
In the Arizona study, nervous system signs were the commonest, in 87.5% of dogs. Breathing signs affected 76.9%, and heart signs 74.5%.
When. Merck says encounters “are most common in warm or mild weather.” In Arizona, 84% of cases came in summer and 75% during a monsoon.
3. What to do
Don’t make your dog vomit. Merck is direct: “induction of emesis is not recommended because of the potential for rapid onset of neurological signs.” Emesis is vomiting.
Flushing the mouth is the first treatment. Merck’s professional guidance says “The patient’s mouth should be immediately and thoroughly lavaged with copious amounts of water.” The Arizona authors agree: “Initiating oral lavage as soon as possible is recommended.”
But be careful with water. Merck also warns that “Affected animals should be prevented from inhaling aerosols of saliva or water that contain toad toxin.” Ask your vet on the phone whether to rinse your dog’s mouth on the way, and how.
Our note: The sources describe mouth flushing as a treatment, without saying whether owners should do it at home. Ask the vet on the phone what to do.
There’s no antidote. Merck says “A specific antidote for toad toxins is not available”. Treatment is supportive: controlling the heart rhythm, seizures and breathing. Merck mentions one specialist antidote for a related heart drug that can be tried in severe cases, but notes its cost “often prohibits its use in veterinary patients.”
Our note: The Merck page’s author lists a private company as their affiliation. A university toxicologist peer reviewed the page.
→ My Dog Ate Something: Why You Shouldn’t Make Them Vomit Without a Vet · → Emergency Signs in Dogs: When to Go Now, Not Tomorrow · → Animal Poison Helplines by Country: Numbers, Fees, and What Works From Where · → Adder Bites (UK and Europe)
4. What we could not verify
| Commonly said | What we found |
|---|---|
| “All toads are deadly to dogs” | No. Serious poisoning generally comes from large toads, such as cane toads and Colorado river toads. |
| “Toad poisoning is usually fatal” | Not with fast treatment. In one Arizona study, 99% of treated dogs survived. Without early treatment, the risk is higher. |
| “Make your dog sick to get the toxin out” | No. Vets advise against it, because seizures can start quickly. |
| “There’s an antidote” | No. There’s no specific antidote for toad toxin. |
| “Toads are venomous” | Poisonous, not venomous. Toads have no venom apparatus; the toxin is in their skin. |
| “Toads are only a problem in Australia” | No. Cane toads are established in Florida, Hawaii and Texas, and the Colorado river toad lives in the US southwest. |
Sources
- Padula A. Toad Poisoning in Dogs and Cats. Merck Veterinary Manual, professional version. Reviewed July 2026. ⚠️ not peer-reviewed. Reference text, reviewed by a university toxicologist. The author’s affiliation is a private company. Pet owner version
- Wilkins A, Cagle L, Wells R, Granfone M. Clinical review of Colorado river toad (Incilius alvarius) intoxication in dogs in Arizona: clinical signs, treatments, and outcomes. J Am Vet Med Assoc 2026. ⚠️ abstract read. Retrospective, 208 dogs, four private emergency hospitals
- Johnnides S, Green T, Eubig P. Toad Intoxication in the Dog by Rhinella marina: The Clinical Syndrome and Current Treatment Recommendations. J Am Anim Hosp Assoc 2016. ⚠️ abstract read. Narrative review
- Nagy AL, Ardelean S, Chapuis RJJ, et al. Zootoxins and Domestic Animals: A European View. Toxins 2024: narrative review
Always confirm with your vet before acting on anything on this page.