PupkeeperToxicEmergency
Dog ate vitamin D supplements? What to do
Too much vitamin D raises calcium in a dog's blood and can cause kidney failure. Signs often start 12 to 36 hours after eating it.
If your dog ate or touched this, call your vet or a pet poison line now
United States
Poison lines in other countries: United Kingdom, Australia, Canada, New Zealand
What to do now
- Call your vet or a pet poison line now.
- Keep the bottle and bring it with you.
- Don't wait for signs. Early treatment gives the best chance of full recovery.
Don't
- Don't make your dog vomit unless a vet tells you to.
Signs to watch for
- Vomiting
- Diarrhea
- Drinking and peeing more
- Belly pain
- Low energy
- Not eating
- Fast or hard breathing
- Bleeding in the gut
When signs appear: 12 to 36 hours
Why
Excess vitamin D makes calcium and phosphorus build up in the body, which can harden soft tissues and damage the kidneys.
Sources
- VCA Animal Hospitals: Vitamin D Poisoning in Dogs
- Merck Veterinary Manual: Poisoning from Human Over-the-Counter Drugs
- Pet Poison Helpline: Cholecalciferol (Vitamin D3)
Guide reviewed 9 October 2026.
General information from the sources above, not a diagnosis. When in doubt, call your vet.