#9 – Apple Cores
While most people try to avoid eating the core of an apple, it's actually much more toxic to dogs. Along with a few other fruits, you should definitely be careful not to leave apple cores laying around for dogs to get their paws on.
What's In It:
The core of an apple (as well as plums, peaches, pears and apricots) contain cyanogenic glycosides which is also known as cyanide.
What It Can Do:
Some of the symptoms that come from ingesting the toxin are dizziness, struggling to breath, seizures, collapsing, hyperventilation, shock and even coma.