Here is the list that I have from our Humane Society on what foods are dangerous and or poisonous to dogs:

Alcoholic beverages
Apple seeds
Apricot pits
Avocados—toxic to birds, mice, rabbits, horses, cattle, and dairy goats
Cherry pits
Chocolate (baker's, semi-sweet, milk, dark)—poisonous to dogs, cats, and ferrets
Coffee (grounds, beans, chocolate covered espresso beans)
Hops (used in home beer brewing)
Macadamia nuts
Moldy foods
Mushroom plants
Mustard seeds
Onions and onion powder
Peach pits
Potato leaves and stems (green parts)
Raisins
Rhubarb leaves
Salt
Tea (caffeine)
Tomato leaves and stems (green parts)
Walnuts
Yeast dough