Why this verdict for dogs
Vitamin D overdose — from supplements, some rodenticides, or psoriasis creams — raises calcium to dangerous levels and damages the kidneys. The effect builds over days.
Warning signs to watch for
- Increased thirst & urination
- Vomiting
- Loss of appetite
- Weakness
⚠ If your dog ate vitamin d supplements
Act immediately — don't wait for symptoms.
- Call your vet or a pet poison helpline right away.
- Note how much was eaten and when.
- Do not induce vomiting unless a professional tells you to.
Poisoning emergencies are expensive
A single toxicity visit can cost hundreds. Compare pet insurance plans that cover accidents and poisoning.
Frequently asked questions
Can dogs eat vitamin d supplements?
No. Vitamin D overdose — from supplements, some rodenticides, or psoriasis creams — raises calcium to dangerous levels and damages the kidneys. The effect builds over days.
How much vitamin d supplements can dogs have?
None — vitamin d supplements is not safe for dogs and should be avoided entirely. When in doubt, ask your vet.
Is vitamin d supplements safe for cats too?
Verdicts can differ between species. See the cat answer for vitamin d supplements →
More medications for dogs
By the CanMyPet Editorial Team · Reviewed against ASPCA Animal Poison Control, the American Kennel Club (AKC) and Pet Poison Helpline · Last updated June 2026.
Sources
- ASPCA — People Foods to Avoid Feeding Your Pets
- American Kennel Club — Dog Nutrition
- Pet Poison Helpline — Poison List