I find it interesting that all this stuff is supposedly deadly to dogs but the dogs eat it anyway and don't have problems. The terrier we had while growing up ate chocolate, table scraps, grapes, raisins, ice cream, pop, anything he could get his mouth on. He never even had indigestion from anything the best I knew unless he was coming down with something already anyway. He finally died of old age around 15 years old.
Dogs have been known to drink out of the toilet and eat unidentifiable things they buried in the yard a week before without getting sick. Excluding blatantly toxic stuff, I think a lot of it is really about sensible moderation. Heck, 60 lbs of chocolate or grapes all at once would do me in too.