If you have a dog who likes to beg shamelessly for food, you know just how difficult it is to say "no" to that face. However, before you give your dog any of your food, make sure it will not harm him. You probably already know that chocolate is toxic to dogs, but you might not be aware of how many other "people" foods are bad for your furry family member. Here are eight foods that should never go in your dog's mouth:

Onions

If the meal you are eating contains any traces of onion, you must keep it far away from your dog. Onions can irritate your dog's stomach and damage his red blood cells. If your pooch ingests onion, it can lead to vomiting, breathing problems, lethargy, and even liver damage. After you chop onion on your kitchen counter, make sure none has landed on the floor.

Avocados

Avocados may be very nutritious for humans, but they are not so good for dogs. Although this fruit will not lead to death, it can make your dog vomit, become constipated, or experience diarrhea. If your dog swallows the big seed in an avocado, it can get stuck in his esophagus or stomach and may require surgery for removal.

Yeast Dough

Yeast dough is another thing you want to keep far away from your pooch. It can expand in your dog's stomach and lead to vomiting, stomach pains, and bloating. If your dog is not taken to the pet hospital right away, he could experience coma, depression, and seizures.

Grapes

Grapes may seem like a perfectly harmless food to feed your dog, but they can do more damage than you think. If your pooch ingests even a small amount of grapes, it could result in kidney failure. Other symptoms of grape toxicity include vomiting, dehydration, lethargy, loss of appetite and stomach pain. It is best to induce vomiting in your dog right away with hydrogen peroxide. Give your dog a teaspoon of peroxide for every five pounds of body weight. Don't give your dog more than three teaspoons at once. If this doesn't induce vomiting, take your pet to the hospital immediately. 

Macadamia Nuts

The next time you are snacking on macadamia nuts, make sure your dog does not get his paws on any. These nuts are toxic to dogs and can cause hyperthermia, vomiting, joint stiffness, stomach pain and tremors.

Fat Trimmings from Meat

After you finish eating your steak or pork chop, you might think your dog will enjoy the leftover fat trimmings. However, think twice before offering your dog meat fat. Fat trimmings from meat can cause pancreatitis in dogs. If you want to give your pooch some meat from your plate, remove the fat first.

Milk

Do not try giving your dog a glass of milk after dinner; the milk sugar in it is difficult for dogs to break down. If you give your dog milk, he could experience vomiting and other stomach problems.

Apple Cores

While apples are safe for your dog to eat, make sure he does not ingest the cores. An apple's core contains toxic substances that can harm your dog. If your pooch swallows an apple core, he could experience difficulty breathing, shock, seizures and coma.

As you can see, there are quite a few foods that can cause dangerous side effects in your dog. It is very important to keep the above foods far away from your furry family member. However, if you dog still ingests one of these foods, you should take him to the emergency animal hospital as soon as possible.