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Foods which are toxic to dogs and other pets
Food Risk
Grapes and raisins For reasons currently unknown, grapes and raisins are highly toxic to dogs! Moderate to large quantities can throw a dog into rapid renal failure. Even with early and aggressive treatment, only about 50% of affected dogs recover. Raisins, being dried and concentrated, are more toxic than grapes.
Onions

Onions contain an ingredient thiosulphate which can cause hemolytic anemia - a condition where the red blood cells burst and are destroyed, leading to anemia. A single large dose of onions or small doses ingested daily can lead to this serious condition. You need to be careful because many foods that wouldn't immediately come to mind, including pizza, Chinese food and baby foods, may contain onion.

Garlic also contains thiosulphate, however in such small amounts that only eating large quantities of garlic would cause toxicity.

Macadamia Nuts An as-yet undetermined substance in Macadamia nuts can cause locomotor disorders when they are eaten by dogs. Symptoms include weakness and trembling of the rear, paralysis and pain. These symptoms are reported to be temporary, however if you think your dog has eaten Macadamia nuts you should notify your veterinarian.
Xylitol (found in sugar-free candies and other foods) Xylitol has been reported to cause a rapid drop in blood sugar, leading to seizures, unconsciousness and possibly liver failure. If your dog eats a product containing Xylitol, get him to your veterinarian immediately.

Fatty foods

Eating foods which are too high in fat can touch off a case of pancreatitis - a painful and sometimes fatal inflammation of the pancreas. After recovery from pancreatitis a dog may have impaired digestive function and be more prone to repeat episodes.
Bones

The most dangerous bones are cooked bones and small bones (like chicken or fish bones) as the can splinter and puncture the digestive tract.

Large, raw bones (i.e. beef bones) are usually safe for your dog to chew, though some dogs are prone to fracturing teeth.

Peach, Plum and Apricot pits, Apple and Pear pips Ingestion of these fruit pits can lead to cyanide poisoning, due to the cyanogenic glycosides they contain.
Chocolate Chocolate contains a substance called theobromine - a cardiac stimulant and diuretic. The purest forms of chocolate (baking cocoa and chocolate) contain the highest concentrations and are the most toxic, followed by dark chocolate. Milk chocolate is slightly less toxic. To a small dog even small amounts of chocolate can cause serious or fatal illness. Symptoms do not appear until several hours after ingestion.
Coffee beans and grounds, tea bags (caffeine) The caffeine in these items is poisonous to dogs.

(Animal Poison Control Hotline numbers)

If you think your pet may have ingested something poisonous the Animal Poison Control Center has trained animal toxicologists available for consultations toll-free by phone 24 hours a day, 365 days a year.

APCC - (888) 426-4435