There are several different kinds of food that is perfectly safe for humans but can cause serious issues for your dog, sometimes even death. If you have a question about a specific food, it's best to call your vet or the Animal Poison Control Center at (888) 426-4435.

Common foods that can be fatal:

• Alcoholic beverages can cause intoxication, coma, and death.
• Chocolate, coffee, and anything with caffeine can be toxic to your dog's heart and nervous system.
• Macadamia nuts affect the muscles, digestive system, and nervous system.
• Raisins and grapes contain toxins that can damage kidneys, cause kidney failure, and lead to death.
• Unbaked yeast dough can expand in their digestive system which causes bloat and can lead to death.
• Hops, an ingredient in making beer, causes panting, increased heart rate, high temperature, seizures, and death.
• Some mushrooms can cause liver, heart, and kidney damage leading to death.

Common foods that can cause serious problems (possibly fatal as well):

• Onions, onion powder, and other plants related to onions can damage red blood cells resulting in anemia. 
• Avocado has a high fat content, which can lead to pancreatitis.
• Other fatty foods such as turkey skin can lead to pancreatitis
• Moldy and spoiled foods may contain many different toxins.
• Large quantities of salt can cause an electrolyte imbalance
• Garlic is similar to onions, but less toxic. Some consider it safe if used sparingly, but it's best to avoid if possible.
• Xylitol sweetener can cause depression, loss of coordination, and seizures.

Additional foods to be concerned with:

• Baby food - may contain unsafe ingredients listed above.
• Seeds and pits from cherries, peaches, plums, apricots, apples, and pears can cause cyanide poisoning.  Avoid pits and seeds unless you know them to be safe.
• Chicken and fish bones can cause lacerations and is a choking hazard.
• Green potato skins contains a toxin.  Cooked potatoes are safe and nutritious.
• Milk and dairy can cause diarrhea if your dog is lactose intolerant.
• Raw salmon can contain a parasite which has a 90% mortality rate.
• Raw eggs can cause a depletion of biotin and may have salmonella.
• Sugar is bad for teeth and can eventually lead to diabetes.
• Tomatoes and tomato plants can cause dilated pupils, irregular heartbeat and tremors.
• Walnuts are poisonous to dogs.
• Nuts in general contains a lot of phosphorus, which may lead to bladder stones.

Sources include the ASPCA - American Society for the Prevention of Cruelty to Animals.