Dogs have a different metabolism compared to humans, and as a result, foods that are not harmful to humans can be potentially deadly or toxic to dogs. Here is a list of foods that should not be fed to your dog:

Alcoholic beverages - intoxication; can also cause coma and death if consumed in larger quantities

Avocado - toxic to cats and dogs; will trigger fluid accumulation in the lungs and chest, leading to difficulty breathing and death due to oxygen deprivation; fluid accumulation can also occur in the heart, pancreas and abdomen

Baby food - some baby foods contain onion powder which is toxic to dogs

Bones from fish, poultry, or any other meat sources - the sharp edges of the bones themselves can cause obstruction or laceration of the digestive system

Cat food - contains too much fats and protein for dogs' digestive systems

Chocolate, coffee, tea, and other caffeine - poisonous / toxic to dogs; contain caffeine, theobromine, or theophylline; affect the heart and the nervous system

Citrus oil extracts - can cause vomiting

Fat trimmings - possible to cause pancreatitis

Grapes and raisins - contain a toxin which can do damage to the kidneys

Hops - can cause panting, elevated temperature and heart rate; can result in seizures and death

Human vitamin supplements containing iron - can damage liver and kidneys and digestive lining

Large amounts of liver - can cause Vitamin A toxicity affecting muscles and bones

Macadamia nuts - contain a toxin which can affect the digestive and nervous system and muscles

Marijuana - affects the nervous system; can cause vomiting and affect heart rate

Milk and other dairy products - most dogs do not have sufficient amounts of the enzyme lactase, which breaks down the lactose in milk - causing diarrhea; lactose-free milk products are available for pets

Moldy or spoiled food, garbage - contain multiple toxins that can cause vomiting and diarrhea

Mushrooms - can contain toxins that can cause shock and result in death

Onions and garlic (raw, cooked, or powder) - damage red blood cells causing anemia - lack of oxygen and energy; garlic is less toxic than onions

Persimmons - can cause intestinal obstruction and inflammation of the small intestine

Pits from peaches and plums - can cause obstruction of the digestive tract

Potato, rhubarb, and tomato leaves; potato and tomato stems - contain toxins; can affect the digestive, nervous, and urinary systems

Raw eggs - decrease the absorption of biotin - Vitamin B; this can lead to skin and hair coat problems; may also contain Salmonella

Raw fish - can result in a thiamine (Vitamin B) deficiency leading to loss of appetite, seizures, and in some cases, death; more likely to occur if raw fish is fed regularly

Salt - if consumed in large quantities, can lead to electrolyte imbalance and result in damage to the kidneys

Sugary foods - lead to obesity and dental problems; can also cause diabetes

Table scraps - they should never be more than 10% of the diet; fat should be trimmed from meat; bones should not be fed; can contain ingredients that can cause allergies in dogs

Tobacco - contains nicotine which affects the nervous and digestive system; can cause increased heart rate, collapse, coma, and even death

Yeast dough - expands and produces gas in the digestive system - results in pain and possible rupture of the stomach or intestines