3. Onions
Onions in large quantities can be very dangerous for dogs, so it's best to avoid feeding them any at all. Gastrointestinal irritation may occur, leading to red blood cell damage.
4. Candies
Artificial sweetener in our candies is called xylitol. This substance is not toxic to humans, but may cause increased insulin production in dogs. High insulin leads to high absorption of sugar from the blood and hypoglycemia in the blood. Low sugar in the blood causes weakness, incoordination and eventually, seizures and liver failure. Xylitol is also found in some toothpastes.