Some foods which are edible for humans, and even other species of animals, can pose hazards for dogs because of their different metabolism. Some may cause only mild digestive upsets, whereas, others can cause severe illness, and even death. The following common food items should not be fed (intentionally or unintentionally) to dogs.
Alcoholic beverages: Can cause intoxication, and death.
Bones from fish, poultry, or other meat sources: Can cause obstruction or laceration of the digestive system.
Chocolate, coffee, tea, and other caffeine: Contain caffeine, theobromine, or theophylline, which can be toxic and affect the heart and nervous systems.
Human vitamin supplements containing iron: Can damage the lining of the digestive system and be toxic to the other organs including the liver and kidneys.
Milk and other dairy products:Some adult dogs and cats do not have sufficient amounts of the enzyme lactase, which breaks down the lactose in milk. This can result in diarrhea. Lactose-free milk products are available for pets
Pits from peaches and plums: Can cause obstruction of the digestive tract
Potato, rhubarb, and tomato leaves; potato and tomato stems: Contain oxalates, which can affect the digestive, nervous, and urinary systems. This is more of a problem in livestock.
Raw fish:Can result in a thiamine (a B vitamin) deficiency leading to loss of appetite, seizures, and in severe cases, death. More common if raw fish is fed regularly.
Tobacco: Contains nicotine, which affects the digestive and nervous systems. Can result in rapid heart beat, collapse, coma, and death.