Hydrogen Peroxide Dog Dosage Calculator
3% hydrogen peroxide emesis (vomiting) induction dosing for dogs — with critical safety screening, step-by-step instructions, and when NOT to induce vomiting.
Call Poison Control FIRST. Before inducing vomiting, always call the ASPCA Animal Poison Control Center +1-888-426-4435 or your emergency vet. Inducing vomiting is contraindicated for many substances and can cause life-threatening injury. Do NOT use concentrations above 3%.
🐶 Introduction
Hydrogen peroxide (H₂O₂) at 3% concentration is an emetic agent used to induce vomiting in dogs when a dog has recently ingested a potentially toxic substance and vomiting is considered safe and appropriate. It works by irritating the gastric mucosa, triggering the vomiting reflex typically within 10–15 minutes.
Important limitation: Recent veterinary research has questioned the routine use of hydrogen peroxide due to risk of haemorrhagic gastroenteritis (severe bloody gastroenteritis) especially at higher doses. The ASPCA Animal Poison Control Center and many veterinary toxicologists now prefer apomorphine (available only at clinics) or ropinirole (Clevor® — prescription) as safer alternatives for induced emesis in dogs.
NEVER use hydrogen peroxide in cats — it causes severe haemorrhagic gastroenteritis and can be fatal in cats.
🚫 When NOT to Induce Vomiting
- Corrosive substances: bleach, drain cleaner, batteries, acids, alkalis — causes further oesophageal damage
- Petroleum products: gasoline, motor oil, paint thinner — aspiration pneumonia risk
- Foaming agents / detergents
- Sharp objects (glass, bones, needles) — laceration risk
- Dog is already vomiting, drowsy, unconscious, or having seizures
- Dog has megaoesophagus, respiratory problems, or cardiac disease
- Ingestion occurred >2 hours ago — stomach likely empty, limited benefit
- Cats — NEVER
📚 Dosing Protocol (3% H₂O₂ Only)
Recommended Dose
- 1 mL/kg body weight of 3% hydrogen peroxide, given orally
- Maximum dose: 45 mL (approximately 3 tablespoons) — even for large dogs
- If no vomiting within 15 minutes, may administer one repeat dose
- Do not repeat more than twice total
Method of Administration
- Draw into an oral syringe (no needle)
- Squirt slowly into the side of the mouth (cheek pouch) or back of throat
- Walk the dog gently after giving — mild exercise may speed onset
- Onset: 10–15 minutes
Concentration Verification — Critical
Only 3% hydrogen peroxide is appropriate. Do NOT use:
- 35% “food grade” H₂O₂ — 12× more concentrated, causes severe gastric burns
- 6–12% hair developer / salon H₂O₂ — too concentrated
- Hydrogen peroxide with added ingredients
📋 How to Use This Calculator
- Call ASPCA Poison Control (+1-888-426-4435) or your vet before proceeding.
- Confirm vomiting induction is appropriate for the specific substance ingested.
- Enter your dog’s weight below to calculate the volume of 3% H₂O₂.
- Confirm the concentration on your bottle says exactly “3%”.
- Administer with a syringe, watch for vomiting within 10–15 minutes.
- After vomiting, contact your vet for further assessment — activated charcoal or IV fluids may be needed.
☣️ H₂O₂ Emesis Dose Calculator (Dogs Only)
After vomiting: Collect a sample of vomit if possible (for vet analysis). Bring the packaging of the ingested substance to the vet. Do not give food or water until the vet advises. Watch for signs of haemorrhagic gastroenteritis (bloody vomit/diarrhoea), which requires emergency care.
📖 References & Methodology
- Plumb DC. Plumb’s Veterinary Drug Handbook, 9th ed. Wiley-Blackwell, 2018. Hydrogen Peroxide entry.
- Hovda LR, et al. Blackwell’s Five-Minute Veterinary Consult Clinical Companion: Small Animal Toxicology, 2nd ed. Wiley-Blackwell, 2016.
- ASPCA Animal Poison Control Center. Induction of emesis guidelines. aspca.org/apcc.
- Küpper J, et al. Comparison of apomorphine and hydrogen peroxide for emesis induction in dogs. J Vet Emerg Crit Care. 2014.