Enter your dog's weight, chocolate type, and amount eaten for an instant toxicity risk level. Based on Merck Vet Manual thresholds | Calculator4U
Estimate risk of chocolate toxicity for dogs.
This chocolate toxicity calculator estimates the theobromine dose your dog received based on its body weight, the type of chocolate eaten, and the amount consumed — and maps that dose to established veterinary toxicity thresholds from the Merck Veterinary Manual and ASPCA Animal Poison Control Center.
Theobromine toxicity thresholds for dogs (Merck Veterinary Manual / ASPCA):
Call your veterinarian immediately, or contact ASPCA Animal Poison Control at (888) 426-4435 or Pet Poison Helpline at (844) 520-4632. Have ready: your dog's weight, the type of chocolate, the approximate amount eaten, and how long ago it was consumed. Acting within the first 1–2 hours is critical — a vet may recommend inducing vomiting to limit absorption. Do NOT induce vomiting at home without specific veterinary guidance. This calculator provides an educational risk estimate only and is not a substitute for professional veterinary advice.
oxicity depends on chocolate type, amount eaten, and the dog's weight — specifically the theobromine dose in mg per kg (mg/kg). Per Merck Veterinary Manual and ASPCA thresholds: 20 mg/kg = mild signs (vomiting, restlessness). 40–50 mg/kg = severe signs (rapid heart rate, tremors). 60+ mg/kg = seizures likely. 100–200+ mg/kg = potentially lethal. Theobromine concentrations: milk chocolate ~1.5–2.1 mg/g. Dark chocolate (70–85%) ~8–10 mg/g. Baking chocolate ~15–22 mg/g. Cocoa powder ~18–25 mg/g. A 20-pound (9 kg) dog eating just 9 grams (0.3 oz) of baking chocolate can reach the 20 mg/kg mild toxicity threshold.
Symptoms progress with dose and typically appear within 2–12 hours (Merck Vet Manual): Mild (20 mg/kg): vomiting, diarrhea, excessive thirst, restlessness. Moderate (40–50 mg/kg): muscle tremors, tachycardia, high blood pressure, excessive panting, hyperactivity. Severe (60+ mg/kg): seizures, cardiac arrhythmia, internal bleeding. Potentially lethal (100–200+ mg/kg): cardiac failure, respiratory collapse. Critical: theobromine's half-life in dogs is approximately 17.5 hours — effects can last up to 72 hours. Do not assume safety because symptoms have not appeared yet.
Dogs metabolize theobromine (chocolate's primary toxic compound) far more slowly than humans. In dogs, theobromine's biological half-life is approximately 17.5 hours — compared to 6–10 hours in humans (NIH PMC). This means theobromine accumulates to toxic levels in dogs far more easily. Theobromine affects the central nervous system, cardiovascular system, and respiratory system, and has a diuretic effect. Dogs also tend to consume large amounts impulsively if given access, and toxicity scales inversely with body weight — small dogs face the greatest risk.
Extremely dangerous — baking chocolate contains approximately 15–22 mg theobromine per gram, around 10 times more than milk chocolate (1.5–2.1 mg/g). For a 20-pound (9 kg) dog: Mild signs from milk chocolate require ~85g (3 oz). Mild signs from baking chocolate require only ~9g (0.3 oz). Severe toxicity from baking chocolate requires only ~27g (1 oz). The Merck Veterinary Manual states baking chocolate at approximately 1.3 g/kg is sufficient to cause symptoms — meaning a 20-pound dog can show symptoms from as little as 12g (0.4 oz). Any ingestion of baking chocolate, cocoa powder, or dark chocolate (70%+) warrants immediate veterinary contact.
Chocolate poisoning can be fatal but death is rare with prompt treatment. The lethal dose of theobromine is approximately 100–200 mg/kg (Merck Vet Manual), though severe signs can occur at much lower doses. ASPCA 2025 data shows chocolate accounts for approximately 13% of all pet poisoning calls — one of the most common toxicoses. Chocolate is most frequently ingested around holidays (Christmas, Valentine's Day, Easter, Halloween) when it is more accessible. With timely treatment — induced vomiting, activated charcoal, IV fluids, antiarrhythmics — the prognosis is generally good if caught early.
Only if specifically instructed by a veterinarian or poison control specialist. If ingestion was within the last 1–2 hours and the dose is significant, a vet may recommend 3% hydrogen peroxide to induce vomiting at a specific weight-based dose. This method is NOT safe for all dogs — those with certain health conditions, brachycephalic breeds (flat-faced), or very small dogs may be at risk. Never use salt, mustard, or other home remedies — these cause additional harm. Call ASPCA Poison Control at (888) 426-4435 or Pet Poison Helpline at (844) 520-4632 for guidance before acting.
No — chocolate is toxic to cats for the same reason as dogs. Cats are considered slightly more sensitive to theobromine than dogs (toxic threshold approximately 200 mg/kg in cats). However, cats rarely eat chocolate because they lack sweetness taste receptors. If a cat ingests chocolate, contact a veterinarian immediately. Important: cat drug metabolism differs critically from dogs — never use canine theobromine doses or treatments for cats. Always use species-appropriate guidance from your vet.