In case you did not know, if the chocolate was ingested within 2 hours, you may benefit the dog by inducing vomiting with hydrogen peroxide. You need to give 1 cup per 50 pounds and the dog will vomit within about 5 minutes and will vomit FOR about 15 minutes, at which time you may offer water to help stop the process. They may or may not drink.
Chocolate Toxicity
For milk chocolate, roughly 1 and a half ounces per 10 pounds is where mild toxicity starts, using Merck’s listed average theobromine concentration and tox thresholds. About 3 to 3 and a half ounces per 10 pounds can cause cardiac signs, and around 4 ounces per 10 pounds can reach seizure risk. But it’s a ballpark, not a safety line. The amount per brand varies and so does each dog. So don’t present it as a safe dose.
3% hydrogen peroxide at approximately ⅓ US fluid ounce per 10 pounds, given orally—equivalent to 10 mL or 2 teaspoons per 10 pounds.
Maximum per dose: 45 mL—approximately 1½ fluid ounces—even for larger dogs. This follows ASPCA’s 1 mL/lb dosing.
Pair the dose with “Only give it if your veterinarian directs you.” Peroxide can injure the stomach; avoid inducing vomiting in dogs with tremors, seizures, reduced alertness, or difficulty swallowing because of aspiration risk. Use only 3%, never stronger concentrations or in cats.
https://drjohnson.com/wp-content/uploads/2019/09/Chocolate-poisoning-1.pdf
