Senior Member
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Too add, dark chocolate is much, much more harmful to dogs than milk chocolate. An average sized dog would have to consume a pound of milk chocolate to kill it.
Alcoholic beverages
Can cause intoxication, coma, and death.
Baby food
Can contain onion powder, which can be toxic to dogs. (Please see onion below.) Can also result in nutritional deficiencies, if fed in large amounts.
Bones from fish, poultry, or other meat sources Can cause obstruction or laceration of the digestive system.
Cat food
Generally too high in protein and fats.
Chocolate, coffee, tea, and other caffeine Contain caffeine, theobromine, or theophylline, which can be toxic and affect the heart and nervous systems.
Citrus oil extracts
Can cause vomiting.
Fat trimmings
Can cause pancreatitis.
Grapes and raisins
Contain an unknown toxin, which can damage the kidneys. There have been no problems associated with grape seed extract.
Hops
Unknown compound causes panting, increased heart rate, elevated temperature, seizures, and death.
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.
Large amounts of liver
Can cause Vitamin A toxicity, which affects muscles and bones.
Macadamia nuts
Contain an unknown toxin, which can affect the digestive and nervous systems and muscle.
Marijuana
Can depress the nervous system, cause vomiting, and changes in the heart rate.
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.
Moldy or spoiled food, garbage
Can contain multiple toxins causing vomiting and diarrhea and can also affect other organs.
Mushrooms
Can contain toxins, which may affect multiple systems in the body, cause shock, and result in death.
Onions and garlic (raw, cooked, or powder) Contain sulfoxides and disulfides, which can damage red blood cells and cause anemia. Cats are more susceptible than dogs. Garlic is less toxic than onions.
Persimmons
Seeds can cause intestinal obstruction and enteritis.
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 eggs
Contain an enzyme called avidin, which decreases the absorption of biotin (a B vitamin). This can lead to skin and hair coat problems. Raw eggs may also contain Salmonella.
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.
Salt
If eaten in large quantities it may lead to electrolyte imbalances.
String
Can become trapped in the digestive system; called a "string foreign body."
Sugary foods
Can lead to obesity, dental problems, and possibly diabetes mellitus.
Table scraps (in large amounts)
Table scraps are not nutritionally balanced. They should never be more than 10% of the diet. Fat should be trimmed from meat; bones should not be fed.
Tobacco
Contains nicotine, which affects the digestive and nervous systems. Can result in rapid heart beat, collapse, coma, and death.
Yeast dough
Can expand and produce gas in the digestive system, causing pain and possible rupture of the stomach or intestines.
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