Yes, we've been down this road before. It's actually high levels of cocoa, so generic milk chocolate doesn't have as much of an effect as, say, dark chocolate. While still bad for dogs, some tend to fare better than others and Frankie is a big guy. He's eaten his fair share of "stuff" over the years, and hasn't had too many problems. He got into Halloween candy one year and ate a bunch of dark snickers minis - he pooped glitter (wrappers) for a few days, but was fine. He's a beast.