My Dog Ate a Vitamin D Pill or Capsule What Should I Do? (Reviewed by Vet)

Reviewed By Evie Moloney, RCVS •  Updated: 02/02/23 •  3 min read
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Vitamin D is a common supplement found in many of our homes. If you accidentally drop a pill or capsule, your dog could pounce on it and swallow the vitamin in a flash. Most vitamin D supplements contain levels of the nutrient that could cause health issues in your fur baby.

High levels of vitamin D can be toxic for dogs. The condition is known as vitamin D poisoning.

Vitamin D Poisoning in Dogs

Your canine companion may not show any symptoms until about 12-24 hours after eating the vitamin D. However, he can have symptoms appear as long as 72 hours later.

It is strongly recommended to contact a Pet Poison Helpline or your veterinarian.

Vitamin D poisoning causes a dog’s calcium and phosphorous levels to rise. This can cause issues with the kidney, heart, gastrointestinal system, or problems with the central nervous system. If left untreated, acute renal failure (kidney failure) can develop, which leads to coma and death.

The supplement can also cause a condition called hypercalcemia, which causes an electrolyte abnormality.

Signs & Symptoms of Vitamin D Poisoning in Dogs

Symptoms of vitamin D poisoning can include:

That’s a pack of nasty symptoms your fur baby could develop just from eating a vitamin D pill or capsule. If your pet has eaten a Vitamin D pill or capsule, it is recommended to immediately phone your veterinarian, so they can discus whether your pet requires immediate veterinary treatment. This will be based on the amount of Vitamin D your pet has eaten in relation to his bodyweight.

Diagnosis and Treatment of Vitamin D Toxicity in Dogs

The vet will ask about your dog’s overall health, his diet and when he ate the vitamin D capsule or pill. If you can also include the dosage of the pill, this will also help the vet. If possible, bring the Vitamin D capsule/pill packaging along with you to your vet visit, or else a photo of the back of the package, showing the ingredients and strength of the pills.

The vet will do a physical exam, along with possibly carrying out bloodwork on your pet. In the bloodwork results, your vet will look at your dog’s kidney function, urine concentration and his electrolyte values. He may also order other tests such as:

Your vet will be checking for specific issues, while also ruling other possible health issues.

After the diagnosis, your fur baby may need urgent medical treatment. This could mean he needs to be hospitalized for up to 48 hours (sometimes longer than this), so the vet can monitor and treat his symptoms.

Vitamin D poisoning can be a serious health threat for your dog. However, with prompt veterinary advice and treatment, many pets have a good chance of a full recovery.

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Evie Moloney, RCVS

This article has been reviewed and approved by an independent Veterinarian: Evie is a vet surgeon who graduated from the University College Dublin, which is the only university offering the veterinary medicine degree in Ireland. She really enjoys surgery and has also worked as an emergency and critical care vet. She is passionate about sharing education about preventative health care for pets, especially the importance of regular dog and cat teeth brushing at home. She also enjoys helping owners find practical solutions for keeping pets as comfortable as possible while living with conditions such as arthritis. When not working, she enjoys hiking and swimming.

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