Absolutely not. Chocolate is among the toxic foods for dogs. Although rarely life-threatening, dogs that eat chocolate can have serious health problems. Chocolate contains caffeine and a dangerous chemical called theobromine. Theobromine, the main toxin in chocolate, and caffeine, which has similar properties, cannot be optimally metabolized by dogs. The amount of theobromine can vary from chocolate to chocolate. Dark chocolate varieties with plenty of cocoa are among the most dangerous for dogs.