Garlic can be fatal to dogs due to a compound called thiosulfate that damages red blood cells. It takes a lot of garlic to cause toxicity, but some breeds are particularly sensitive.
Vitamins containing iron can be toxic for dogs, as they can damage their digestive system wall lining, kidneys, and liver.
Avocados are dangerous, partly due to a fungicidal toxin called persin. Only high doses are lethal, but mild symptoms like vomiting and diarrhea can occur from consuming smaller portions.
Mustard won't be lethal to dogs in small doses, however, it can be toxic in higher amounts. In fact, due to mustard’s mild toxicity, it's often something that’s suggested by vets as a way to induce vomiting when needed.
The flesh of apples is not toxic, but the seeds can be poisonous due to a compound called amygdalin. However, they have to be consumed in large quantities and chewed to be toxic.
Giving your dog a raw, uncooked bone to chew on is great, but avoid cooked bones. These can easily splinter and in large quantities cause constipation or perforation, which can be fatal.
If your dog eats unbaked dough, it can be extremely dangerous because the fermenting yeast gets quickly absorbed in the bloodstream, where it produces enough ethanol to cause alcohol poisoning.
Nutmeg contains a compound called myristicin, which, when ingested by dogs in large quantities, can lead to rapid heart rate, hallucinations, and seizures.
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