Some People Foods Are Safe for Your Dog, Others Aren't

10. Onions Contain a Toxic Substance

There is a compound found in onions that's known as N-propyl-disulfide. This compound gives onions its strong odor. It is also the cause of eye irritation when you peel and slice an onion.

Other than that, N-propyl-disulfide is not dangerous to humans. It can, however, damage your dog's red blood cells. This substance found in onions lessens the red blood cells' ability to transport oxygen. It also causes a dog's body to treat blood cells as invaders, resulting in anemia. This, if not treated promptly, can lead to internal organ damage, organ failure, or even death.

It's not simply the white fleshy part of the onion that is dangerous to dogs. Every part of the onion can cause distress and blood cell damage to your furry friends. This includes the leaves, the juice, and even processed onion powders that you might sprinkle on foods to add flavor.