While it is often hard to tell your dog no when he begs for your food, you should be strong and do so. Feeding your dog table scraps is a bad idea for several reasons. The obvious reason is that you will be encouraging him to beg at the dinner table, you will be feeding him an unhealthy which can lead to health problems, and also teaching him that it is okay to eat whatever he may want.
If you give in when your dog begs for your food, especially if you are at the table, he will think that behavior is okay, and will associate it with getting what he wants, table food.
Feeding your dog table food also can contribute to many serious health problems. The food we eat is often considerably higher in calories than what he needs to meet his nutritional requirements, therefore leading him to be overweight. Studies show that over half of today's pets are considerably obese.
Table scraps are usually low in vitamins and nutrients, and can overload your dog system with fat causing stomach and digestion problems. Many foods that we eat contain toxins that are safe for us, but can be detrimental to your dog cardiovascular system.
To ensure your dog health, you should really only feed him food that is intended for dogs. Again, you talk to your veterinarian. Your dog's health should be the number one priority, and just like children, he doesn't know what is best for him, you have to make those decisions.