• No matter how high quality the food you feed your dog may be, your pup will always want to have what you're eating. Unfortunately, many foods that are good for humans are bad, or even deadly, for dogs. Some of the most dangerous foods are spotlighted here, but for a complete list, check out a dog reference book. If your dog eats any of the toxic foods, contact your veterinarian immediately.
  
  

Raw Salmon

• Of all the foods that are bad for dogs, raw salmon is one of the deadliest. Raw salmon often contains a parasite that is harmless to humans but causes salmon poisoning disease (SPD) in dogs. Among dogs, SPD has a 90 percent mortality rate.
  
  

Onions

• A dog that has eaten a whole onion or more than a cup of chopped onion---raw or cooked---is in danger of hemolytic anemia. This disease attacks the dog's natural immune system, killing the red blood cells that fight infection. Signs of hemolytic anemia include dark urine, rapid breathing, vomiting and lethargy.
  
  

Tomatoes

• The tomato plant and its leaves are most toxic to dogs, followed by green or unripened tomatoes and then by ripe tomatoes. The tomato plant or fruit can cause tremors and irregular heartbeat.
  
  

Grapes and Raisins

• As little as 9 oz of grapes or raisins is enough to make your dog ill. Symptoms include vomiting and diarrhea; then, within 24 hours of eating the grapes or raisins, the dog is likely to suffer from kidney failure. A pound or more of grapes or raisins is enough to kill your dog.
  
  

Chocolate

• Milk chocolate, semi-sweet chocolate and baker's chocolate are all poisonous for dogs. A toxic dose would be 1 oz of milk chocolate for every pound of your dog's body weight, 1 oz of semi-sweet chocolate for every three pounds of body weight or 1 oz of baker's chocolate for every nine pounds of body weight. Increased urination, muscle tremors and rapid heart rate are signs that your dog is suffering from chocolate poisoning.