Vitamin D Toxicity: When a Supplement or Rodenticide Causes Real Harm

Vitamin D toxicity in pets comes from two fairly different sources that share the same underlying danger: either a pet getting into a human vitamin D supplement bottle (these are more concentrated than most people realize, and a bottle of gummies is a genuinely attractive target for a dog), or ingesting a cholecalciferol-based rodenticide, which is specifically formulated to cause this same toxic mechanism in rodents.

Either way, the danger comes from a resulting spike in blood calcium, which damages the kidneys, heart, and blood vessels over the following days.

Symptoms to watch for: increased thirst and urination in the first day or so, followed by vomiting, lethargy, and decreased appetite as calcium levels climb and kidney effects develop, sometimes over several days rather than immediately.

What to do right now: any known ingestion of a vitamin D supplement bottle (not just one incidental gummy) or any suspected cholecalciferol rodenticide exposure should be treated as needing same-day assessment, given how the delayed kidney effects make this progressively harder to treat the longer it goes unaddressed.

When it's an emergency: any known ingestion of a rodenticide of this type specifically, or a supplement bottle where a meaningful number of tablets/gummies are unaccounted for.

## Related Reading

• Why Tylenol Is Especially Dangerous for Cats
• Human Painkillers Are More Dangerous to Pets Than People Assume
• Hand Sanitizer: A Small Bottle, a Real Alcohol Risk

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This is general information, not a substitute for an actual assessment of your specific pet, weight, and situation. If you're ever unsure whether something your pet ate needs immediate attention, a quick video vet consultation can tell you in minutes whether to monitor at home or head to a clinic.