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4. Onions

It is not very likely that your dog will be too crazy about onions but in case your dog is has a bit of a sweet tooth for this veggie, you should know that onions are actually toxic for dogs. This is because of a substance called Thiosulphate that can cause a type of anemia where the dog’s red blood cells are basically destroyed.

Onions are highly toxic for dogs and even as little as 600 grams can be very harmful. In addition, the toxicity can build up over time so small but frequent amounts of onions are bad as well. You should be careful not to give your dog any foods that contain onions and the same goes for onion powder and all similar products.

Signs of poisoning include diarrhea, vomiting, lethargy and difficulty breathing. If your dog does eat some onions, try to induce vomiting and take him to the vet.