4. Garlic and Onion (toxic to dogs, liver damage; avoid mushrooms, too)
5. Butter, and Seasonings (upset tummy, diarrhea; Nutmeg is toxic to dogs)
6. Alcohol (alcohol poisoning, seizures, toxic to dogs)
7. Raisins (toxic to dogs)
8. Dark chocolate (Bakers [cooking] chocolate especially dangerous!)
Keep your dog clear of the kitchen while cooking to avoid consumption of toxic foods, falls, and sharps. Anything deemed "safe" should only be given in moderation (too much quantity and change in diet may result in upset tummy, or worse).
ASPCA Animal Poison Control Center (888) 426-4435.