My dog ate chocolate: how bad is it?
Estimate the risk from your dog's weight, the type of chocolate, and how much went missing. The math errs on the cautious side. When in doubt, skip the calculator and call.
This dose is below the level that typically causes signs. Watch your dog for the next 12 hours and call your vet if you see vomiting, restlessness, or anything unusual, or if the real amount could be higher than you entered.
How this works
Chocolate's danger comes from theobromine (plus some caffeine), which dogs metabolize very slowly. Darker means more theobromine per ounce: cocoa powder and baking chocolate are many times stronger than milk chocolate. Mild signs typically start around 20 mg per kg of body weight, heart effects around 40, and seizures around 60, which is why the same candy bar can be a non-event for a Labrador and an emergency for a Chihuahua.
The calculator uses the high end of published theobromine ranges, so it deliberately overestimates rather than underestimates. It also cannot know if the wrapper, raisins (also toxic), or macadamias went along for the ride: tell your vet everything that was in reach.
This is general educational information, not veterinary advice. When in doubt about your own pet, ask your veterinarian.
If your pet just ate something risky, act now: call your vet, ASPCA Animal Poison Control at (888) 426-4435, or Pet Poison Helpline at (855) 764-7661 (consultation fees may apply).