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Question:

Dog ate Vitamin D3 supplement

I'm really freaking out right now and could use some advice. My overly curious golden retriever, Max, managed to snag a Vitamin D3 supplement from the kitchen counter earlier today. I'm pretty sure he swallowed it before I could stop him. I've read that Vitamin D3 can be harmful to dogs in large amounts, and now I'm worried sick. So far, he seems to be acting normally—still as energetic and playful as ever—but I just can't shake the feeling that something might be wrong internally. Does anyone know how serious this could be? Should I take him to the vet immediately, or is there something else I can do at home first to make sure he's okay? I'm really hoping I'm just overreacting, but I can't imagine something happening to my little furball. Any advice or shared experiences would be seriously appreciated. Thanks in advance!

Answer:

Hello there! It’s understandable to be concerned when your dog gets into something they shouldn’t. Vitamin D3, while essential in small amounts, can be toxic to dogs if consumed in high doses.

When dogs ingest too much Vitamin D3, it can lead to a few potential issues. It primarily affects their calcium balance, causing increased calcium levels in the blood. This can have a range of effects, like affecting kidney function.

Keep an eye on your pup for signs such as vomiting, increased thirst and urination, drooling, or a decreased appetite. These symptoms might take some time to show up, so I’d recommend being vigilant over the next 24 to 48 hours.

For now, try to keep your dog well-hydrated and monitor their behavior. Avoid giving them any additional treats or foods with Vitamin D until we know more about how much they’ve ingested and what the effects are.

If your dog begins showing any concerning symptoms or if you're unsure about how much they ate, it's important to act quickly. Reach out to a vet immediately.

To get personalized advice and peace of mind, I encourage you to book a video consult with us at Dial A Vet. We can guide you on the next best steps for your furry friend’s health. Stay calm—we’re here to help!

Answered by

Louise - Senior Veterinary Nurse, Dial A Vet

June 17, 2025

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The "Ask a Vet" forum on Dial A Vet offers general information and helpful tips on pet health, but it's not a substitute for professional veterinary care. The advice here doesn't create a veterinarian-client-patient relationship, and our vets can't diagnose or treat your pet remotely. For emergencies or specific medical concerns, always contact your local veterinarian immediately. Your pet's health is unique, and decisions should only be made after consulting with a qualified professional. By using this forum, you acknowledge these limitations and agree to seek in-person veterinary advice for all your pet's health needs. View our content guidelines.
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