Also sold as ferrous sulfate, ferrous gluconate, ferrous fumarate, prenatal vitamins, Slow Fe, Feosol
At amounts a dog can reach in a normal household, this needs a vet or poison-control call straight away rather than watching and waiting.
Iron overdose is one of the exposures where a dog can appear to get better and then get much worse. After early vomiting there is often a quiet phase of several hours that reads as recovery, followed by liver injury and shock. Call at the time rather than judging by how your dog looks.
Call a vet or poison control now. Do not wait for symptoms.
ASPCA Animal Poison Control (888) 426-4435 or Pet Poison Helpline (855) 764-7661. A consultation fee may apply.
Part of Diabetes, hormones and vitamins on our medication safety hub.
Part of our guide to My Dog Ate Iron Supplements: Bottle, Dose, and Timing.
Do not wait for symptoms and do not wait until you have filled in the form below. Call first, then use the checklist while you are on the phone.
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Exposure details to have ready
These are the questions a veterinarian or poison-control operator will ask. Fill in what you know and leave the rest blank. This tool does not estimate a dose or a risk score: medication risk depends on the exact ingredient, strength, and formulation, so the assessment has to come from the clinician on the call.
- Keep the package, blister pack, or prescription bottle. The strength and the full ingredient list are what make the advice specific.
- Do not induce vomiting unless a veterinarian or poison-control professional tells you to. It is the wrong move for several medications and can cause harm on its own.
- Do not give milk, food, salt, hydrogen peroxide, or any home remedy on your own.
- Do not give a second dose of anything to make up for one you think was missed.
- Count what is left in the packet, so the number missing can be worked out.
Your exposure summary
Read this down the phone or paste it into a message to your vet. It stays on your device; nothing here is sent to DogSafe.
Why Iron Supplements is dangerous
Iron in supplement form is corrosive to the stomach and intestinal lining, which is what causes the early vomiting and the blood in it. Absorbed beyond what the body can bind, free iron then damages the liver and disturbs blood clotting and blood pressure. The deceptive middle period is a recognised feature of iron poisoning, not a sign that the danger has passed, and it is the reason early assessment matters more here than the dog's immediate appearance.
Part of the Vitamin D guide
For related dog-safety questions and product-by-product answers, see the complete vitamin d guide.
Prenatal and children's vitamins are the usual source
Prenatal vitamins carry substantially more iron than a general multivitamin, and children's chewable vitamins are formulated to taste good, which is a poor combination with a dog. A chewed bottle of either is worth a call even when you cannot say how many are gone.
Elemental iron versus the number on the label
Bottles state the salt (ferrous sulfate, gluconate, fumarate) and its weight, but the amount that matters is the elemental iron inside it, which differs by salt. This is the single most common reason an owner's own estimate of severity is wrong in both directions. Let the vet do the conversion from the actual label.
The quiet phase is the trap
Many owners call after the early vomiting settles, are reassured that the dog seems brighter, and stand down. Iron poisoning classically does this before the liver effects appear. Any assessment should be made by a clinician who knows the amount, not by watching.
Signs to watch for
Early vomiting, sometimes with blood; diarrhea; belly pain; then an apparently settled period; later lethargy, weakness, pale gums, rapid heart rate, collapse, and yellowing of the gums or eyes
Related items
Check the exact item or ingredient before assuming two similar exposures carry the same risk.
What to do next
Call, then bring the bottle. Count what is missing, note the time, and do not let an apparent recovery in the first hours change the plan.
🚨Step-by-step: what to do in the first 10 minutes →Available 24/7. A consultation fee may apply.
A closer look at iron supplements
Iron in supplement form is corrosive to the stomach and intestinal lining, which is what causes the early vomiting and the blood in it. Absorbed beyond what the body can bind, free iron then damages the liver and disturbs blood clotting and blood pressure. The deceptive middle period is a recognised feature of iron poisoning, not a sign that the danger has passed, and it is the reason early assessment matters more here than the dog's immediate appearance. The details below use the specific facts for this exposure, rather than treating it like every other medication question.
1. Start with the exact exposure
For a closely related comparison, read Vitamin D. The relevant figure is elemental iron, which is not the number printed largest on the bottle: a tablet labelled 325 mg ferrous sulfate contains far less elemental iron than that. Do not try to work this out yourself. Take the bottle, or a photo of the full label, so the vet can calculate it properly against your dog's weight.
2. Use the facts to decide whether to monitor or call
Another helpful reference is Human Medicine Exposures. Nothing to manage at home, and specifically do not wait out the quiet phase. Call a vet or poison control promptly. Do not induce vomiting unless instructed: the material is corrosive on the way back up. Promptly for any meaningful exposure, and immediately for repeated vomiting, blood in vomit or stool, black tarry stools, weakness, collapse, a racing heart, or pale gums.
3. If the details are uncertain
Follow the first 10 minutes guide. Call, then bring the bottle. Count what is missing, note the time, and do not let an apparent recovery in the first hours change the plan.
FAQ
The relevant figure is elemental iron, which is not the number printed largest on the bottle: a tablet labelled 325 mg ferrous sulfate contains far less elemental iron than that. Do not try to work this out yourself. Take the bottle, or a photo of the full label, so the vet can calculate it properly against your dog's weight.
Nothing to manage at home, and specifically do not wait out the quiet phase. Call a vet or poison control promptly. Do not induce vomiting unless instructed: the material is corrosive on the way back up.
Promptly for any meaningful exposure, and immediately for repeated vomiting, blood in vomit or stool, black tarry stools, weakness, collapse, a racing heart, or pale gums.
Not necessarily, and this is the specific reason iron is on this list. The settled period between the early stomach signs and the later liver effects is a normal part of the pattern. Call with the label details rather than relying on how your dog seems.
Dog-formulated multivitamins generally contain much less iron than human prenatal supplements, but a whole container is still worth a call. Read the label and give the elemental iron figure if it is printed.
- Merck Veterinary Manual — poisonings from human prescription and over-the-counter drugs (iron toxicosis: corrosive gastrointestinal injury, latent phase, hepatotoxicity)
- ASPCA Animal Poison Control Center — vitamins and supplements
- Pet Poison Helpline — top 10 human medications poisonous to pets
- Merck Veterinary Manual: Poisonings from human prescription drugs
- ASPCA Animal Poison Control
- Pet Poison Helpline: Top 10 human medications poisonous to pets