I know chocolate can be toxic to dogs, so I'm a bit concerned. Years back I had a dog eat a platefull of brownies and nothing happened, so I'm hoping it's one of those accumulative things. Any suggestions? Do you think a dose of pepto would do her any good? Has anyone had this happen to their dog? Murphy Brown is about 27lbs, and she ate about a third of a large dark chocolate bar. Stupid me left it on the coffee table last night and she found it this morning.