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Onion and Garlic
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Raw, cooked and powdered garlic and onion have the potential to cause a condition known as Heinz body anemia. It appears, however, that the small amounts found in dog treats and dog food are not sufficient to cause problems.
Potatoes
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Potatoes cause problems when they present green tubers. Such tubers contain solanine, which may cause drooling, diarrhea, vomiting, irregular heartbeat, weakness and dizziness.
Tomatoes
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As with potatoes, green tomatoes and parts of the tomato plant may cause symptoms of solanine toxicity. Ripe tomatoes are not considered toxic.
Other Dangers
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Corn is not toxic, but some dogs may eat the cob whole, resulting in partial or total intestinal blockage. Dogs prone to calcium oxalate bladder stones should avoid oxalate-producing vegetables such as spinach, rhubarb, broccoli and celery.
Considerations
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Most vegetables are sprayed with chemicals. It is best to wash vegetables that are not toxic for dogs (carrots, green beans, peas) thoroughly before preparing them for dogs, or use only organic produce.
Warning
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Any new food introduced to a dog's diet or given in large amounts may cause gastrointestinal upset. Feed only small amounts of vegetables at a time or consult with a veterinarian if in doubt.
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What Vegetables Are Dangerous for Dogs?
Often, humans enjoy sharing food with their dogs. However, not everybody is aware that dogs metabolize food in a different way from humans and that some vegetables may be even dangerous to feed to dogs. Listed below are some vegetables that should not be shared with your canine companions.