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.
https://drjohnson.com/wp-content/uploads/2019/09/Chocolate-poisoning-1.pdf
