THC Toxicity in Dogs Calculator
Estimate how much THC your dog may have ingested per kilogram of body weight, and understand the likely severity level — so you can act quickly and talk to your vet with the right numbers.
What this level usually means
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Signs to watch for
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Expected timing
Eaten THC usually causes signs within 1–2 hours (up to 4 hours on an empty stomach); inhaled smoke can act within minutes. Effects can last 1–3 days.
Context on lethality
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Any suspected THC ingestion warrants a call to your veterinarian or an animal poison control line. In the US: ASPCA Animal Poison Control (888) 426-4435 or Pet Poison Helpline (855) 764-7661. Outside the US, contact your local vet or emergency animal hospital. Bring the product packaging if you have it.
Overview
The THC Toxicity in Dogs Calculator helps worried pet owners quickly estimate the dose of tetrahydrocannabinol (THC) their dog may have ingested, expressed in milligrams per kilogram of body weight. Dogs are far more sensitive to THC than people because they carry a higher density of cannabinoid receptors in the brain, so even a "small" amount by human standards can produce noticeable effects in a dog.
This tool is built for dog owners, pet sitters, and caregivers who have found their dog eating an edible, cannabis flower, or a concentrate and need a fast, body-weight-adjusted sense of how serious the situation might be. It converts whatever you know — pieces of an edible, grams of bud, or a known milligram figure — into a single dose-per-weight number and a plain-language severity level, giving you the exact figures to share with a veterinarian.
How It Works
- Enter your dog's body weight and choose kilograms or pounds.
- Select how the THC was consumed — a labeled edible, cannabis flower, a concentrate, or a known total in milligrams.
- Fill in the matching fields (for example, mg per gummy and number of gummies, or grams eaten and the THC potency percentage).
- Press Calculate. The tool works out the total THC in milligrams, divides it by your dog's weight in kilograms, and shows the estimated dose plus a severity band.
- Use Reset to clear everything and start over.
Nothing is calculated until you click Calculate, and the result is deliberately conservative so it errs toward caution rather than underestimating the risk.
Formula Explanation
At its core the calculator reduces every input to one figure — total THC in milligrams — and then divides by body weight:
Total THC is derived differently depending on the source you select:
Weight entered in pounds is converted first: kg = lb ÷ 2.2046. For flower and concentrates the tool treats the full labeled THC content as available, which is a worst-case assumption — raw, unheated cannabis is less potent because much of its THC is still in acidic form — but for a safety estimate it is safer to assume the higher figure.
The dose is then banded using veterinary reference points: mild signs can appear from roughly 0.3 mg/kg, moderate signs from about 2–3 mg/kg, and the reported minimum lethal oral dose exceeds 3,000 mg/kg, which is why fatalities are extremely rare.
Practical Benefits
- Speed when it matters. In the first frantic minutes after a dog eats something it shouldn't, a quick dose estimate helps you decide how urgently to act.
- Better vet conversations. Arriving with a dose-per-kilogram figure and the product details lets your veterinarian triage faster and more accurately.
- Weight-aware perspective. The same gummy is a very different dose for a 4 kg Chihuahua than a 35 kg Labrador — this tool makes that difference obvious.
- Reassurance grounded in data. Because the lethal threshold is so high, most exposures are frightening but survivable; seeing the numbers can reduce panic while still prompting proper care.
