Common Foods That Are Unsafe For Your Dog

The ASPCA’s List of 13 Foods to Avoid Feeding Your Pet:

Alcoholic Beverage s Can cause intoxication, difficulty breathing, tremors, coma and death.
Avocado (the leaves, fruit, seeds and bark) Can cause vomiting and diarrhea in dogs.
Bones – Raw or Cooked (beef, chicken, fish, etc.) Can splinter, causing lacerations and can also cause obstructions.

Chocolate, Coffee and other forms of Caffeine
All contain substances called methylxanthines,which can cause vomiting and diarrhea, panting, excessive thirst and urination, hyperactivity, abnormal heart rhythm, tremors, seizures and even death. 

Similar to onions (below) except “an occasional low dose [of garlic], such as what might be found in pet foods or treats, likely will not cause a problem.” It’s recommended that you do NOT give your pets large quantities of garlic.
Macadamia Nuts Contains toxins which can cause weakness, depression, vomiting, tremors and hyperthermia in dogs.
Moldy or Spoiled Foods Could contain multiple toxins
Onions, Onion powder, Chives Contains sulfoxides and disulfides which can damage red blood cells, resulting in anemia.
Raisins and Grapes Contains toxins which can damage kidneys, cause kidney failure and lead to death.Salt
Raw or Undercooked Meat Despite the popularity of raw diets for dogs, the ASCPA has added this to their list saying that it “can contain bacteria such as S almonella  and  E. coli  that can be harmful to pets.”
Salt Large amounts can cause vomiting, diarrhea, depression, tremors, elevated body temperature, seizures and even death.
Yeast Dough (Unbaked)
Can expand in digestive system and cause bloat, leading to death.

Xylitol (used to sweeten  gum, candy, baked goods and toothpaste
This common artifical sweetener is very dangerous to dogs and can cause a sudden drop in blood sugar, leading to liver failure. Signs of ingestion include vomiting, loss of coordination, lethargy and seizures.

Additional Foods to Avoid Feeding Your Pet:

Baby Food Could contain onion powder so read label carefully (see onions, above).
Cherry, Peach, Plum, & Apricot Pits, Apple & Pear Seeds Contain cyanogenic glycosides which can result in cyanide poisoning. It is best to avoid all pits and seeds unless you know them to be safe.
Chicken or Fish Bones Can splinter, causing lacerations and can also cause obstructions.
Green Potato Skins Contains a toxin, solanine, which is only found in green tubers and green potato skins. Cooked potatoes are safe and nutritious for dogs.
Hops (used in making beer) Causes panting, increased heart rate, elevated temperature, seizures and death.
Milk and Dairy Products Like people, some dogs can be lactose intolerant, resulting in diarrhea. 
Mushrooms Depending on the mushroom, toxic effects include damage to the liver, heart, or kidneys causing death. 
Turkey Skin and other rich, fatty foods like Bacon, Sausages, etc. The high fat content in turkey skin can cause acute Pancreatitis in dogs. 
Raw Salmon Those feeding their dogs a raw diet, please avoid raw salmon which can contain a parasite that causes an illness (SPD) with a 90% mortality rate. 
Raw Eggs Best to avoid since it can cause a depletion of biotin and be contaminated with salmonella. 
Sugar Bad for teeth and could contribute to the onset of Diabetes.

Tomatoes/Tomato Plants
Contains toxins known to cause dilated pupils, tremors and irregular heartbeat. The leaves and stems of tomato plants are the most toxic followed by unripe (green) tomatoes and ripe (red) tomatoes.

Walnuts & most nuts
Walnuts are poisonous to dogs. Many nuts are not good for dogs in general; their high phosporus content is said to possibly lead to bladder stones.
Cocoa Mulch (used outdoors as a mulch) Although mulch isn’t food, there is one type that is tempting enough for dogs to eat. Some dogs are very attracted to cocoa mulch and will eat it. The coca bean shells can contain from 0.2% to 3% theobromine (the toxin ) as compaired to 1-4% in unprocessed beans and can be quite dangerous.