Contact a vet or your local Poisson control center for advice. While a helper restrains the dog, administer an emetic, if this is appropriate. Hydrogen peroxide is usually effective, given in small amounts by tablespoon until the dog vomits. Why pay more than 5 cents a minute for long distance. Resources Dog Bite Prevention - Dogs are good.
Dogs are our friends.
But, you still need to exercise caution when training your own pet or are confronted with an unfamiliar animal.