Saying "Just give it to the dog." is a bad thing. Depending on what type of food it is, it may or may not be digestible by canines. A person should always do research and check with a vet about what foods a pet can and can't have. Feeding foods that may be inappropriate for your pet and you're going to be in a world of hurt and plenty of vet bills.
True enough.
Foods that ferment can cause lethal bloat.
Lettuce, beans, broccoli etc... bad for dogs
Grapes, onion, garlic, bad for dogs
Meat scraps are good I bet, just watch the bones