Large amounts of caffeine can cause caffeine poisoning, and there is no antidote.
Onions and Garlic
Any form of onions and garlic can destroy a dog's red blood cells and lead to anemia.
The agent in chocolate is theobromine. This is in all kinds of chocolate. The smallest amounts of chocolate can cause your dog to become very ill. Larger amounts can also cause abnormal heart rhythm, tremors, seizures, and death.
Candy and Gum
Candy and gum contain xylitol which makes the foods sweet. This chemical can cause an increase in the insulin int he dog's body. Which can cause your dog's blood sugar to drop and can also cause liver failure.
It isn't clear as to why, but grapes and raisins cause kidney failure in dogs, and just a small amount can make a dog sick.
Feeding your dog raw eggs increases the chance of food poisoning from bacteria like Salmonella and E Coli.There is also an enzyme in raw eggs that interferes with the absorption of a certain B vitamin.
Trimmed fat from meat, both cooked and uncooked, can cause pancreatitis in dogs and giving your dog the left over bones can splinter and cause an obstruction to your dog's digestive system.
Milk and other dairy products can make a dog very sick. Causing diarrhea, vomiting and other digestive issues.
Alcohol has the same effect on a dog's liver and brain as it does to a human's liver and brain. But only a little bit of alcohol can go a long way for dogs and it can lead to very severe results as in a coma or death.
Avocados contain persin which is in the leaves, seed, and bark, as well as in the fruit and large amounts can be very toxic to dogs.
Sharing your pretzels and chips can cause excessive thirst and urination and even lead to sodium ion poisoning.Too much salt for dogs is a bad choice.
The issue with persimmons, peaches and plums are their pits/seeds. Seeds from persimmons can cause inflammation to the dogs small intestine. While the pits of peaches and plums contain cyanide, which is poisonous to both humans and dogs. Dogs don't know to not eat them.
Ingredients in common medicine taken by humans such as acetaminophen or ibuprofen are common in pain relievers and cold medicine to us but, they can be deadly for your dog.
Like raw eggs, raw meat and fish can cause food poisoning from Salmonella and E Coli, but the risk is higher because there are more choices of meat and fish that can bring different harmful bacteria.
If your dog eats bread dough before it is bakes, it will do the same thing in their stomach as it does in the oven. As it swells inside, the dough can stretch the dog's abdomen and cause a lot of pain.
Macadamia nuts and foods containing these nuts can make the dog very ill and cause poisoning to the dog.
Too much sugar has the same effect on a dog as it does to humans.