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Foods you should not Feed your Dog

Updated on September 27, 2010

Certain food can be toxic for your dog, and their use in your dog’s diet should be avoided where possible. The list below identifies these foods and explains the possible consequences.

Chocolate is bad for dogs
Chocolate is bad for dogs


Chocolate contains theobromine, a bitter alkaloid which is poisonous to dogs. Different chocolate products will contain different levels of theobromine, making some safer than others. You should also consider the dogs sensitivity and size.

As little as 50 grams for smaller dogs, and 400 grams for an average sized dog can be enough to cause theobromine poisoning in dogs.

Signs and symptoms of theobromine poisoning includes:

  • Vomiting
  • Dehydration
  • Increased heart rate
  • Restlessness
  • Hyper irritability
  • Increased urination

If you notice signs of theobromine poisoning in your dog contact the vet immediately and seek proper treatment.

Onions and Garlic

Onions contain a substance called thiosulphate which dogs cannot properly digest. Thiosulphate causes oxidation of haemoglobin damaging red blood cells. This can ultimately result in hemolytic anemia and even heart failure.

Onions in small doses will probably not result in a problem. Different breeds and sizes of dog will react in different ways. Therefore it is advisable to be careful when cooking anything with a lot of onions, and with leftover pizza and burger etc.

Symptoms of onion toxicity include vomiting, weakness, diahhorea and blood in the urine.

Large amounts of garlic can cause similar toxicity problems in dogs. Garlic contains a smaller amount of thiosulphate so would need to be consumed in greater quantities to cause problems.

Grapes and Raisins

Grapes and raisins can cause kidney failure to dogs. The reason behind the health threat posed by grapes and raisins to dogs is not yet known. The estimated toxic dose it thought to be 32 g/kg with Animal Poison Control indicating that as little as 7 grapes can be toxic.

Eating a few grapes should not cause any immediate problem to your dog, but keep a lookout for any symptoms and visit a veterinarian at the first sign of grape or raisin toxicity.

Common symptoms include vomiting, diarrhoea and hyperactive behaviour.

Dog eating
Dog eating

Other foods that dogs should avoid

  • Macademia nuts
  • Rhubarb leaves
  • Cat food
  • Alcohol
  • Corn on the cob
  • Avocado
  • Mushrooms
  • Potato peelings
  • Dough
  • Coffee


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    • almurray profile imageAUTHOR

      Alan Murray 

      8 years ago from Ipswich, United Kingdom

      Thanks Nell

    • Nell Rose profile image

      Nell Rose 

      8 years ago from England

      Hi, very good info here, especially for someone who has recently bought a dog for the first time, nice one, cheers nell


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