Why is it dangerous to pets?
Iron is directly corrosive to the stomach lining and, once absorbed, damages the liver and causes shock. Signs come in two phases: gut upset first, then a deceptive improvement, then severe deterioration 12–48 hours later.
Prenatal vitamins often contain 27–65 mg of elemental iron per tablet — a handful is a serious dose for a dog.
Why speed matters
Delaying care significantly worsens outcomes. Some signs appear hours or days later, so "looks fine right now" is not a reason to wait.
Symptoms of iron-supplements poisoning
- Vomiting, often bloody, and diarrhoea
- Abdominal pain, drooling, not eating
- Lethargy, weakness, fast heart rate
- A period of seeming improvement (do not be reassured)
- Shock, collapse, liver failure and seizures in severe cases
What to do right now
- Call a vet or poison line immediately — iron poisoning is time-critical even when the pet seems fine.
- Bring the bottle and count the missing tablets.
- Do not induce vomiting unless instructed; iron can burn on the way back up.
- Expect blood tests and hospital care, sometimes for several days.
If your pet shows any of the signs above, go to the nearest emergency vet now and call ahead.
Sources & further reading
- ASPCA Animal Poison Control — pet poison database & dosage references
- Pet Poison Helpline — toxicology triage guidelines
- Merck Veterinary Manual — toxicology monographs
- Vets Now (UK) — emergency toxicosis guidance