Is putting garlic on a dogs food good for it?

Onions, garlic, chives, and leeks are in the Allium family, and are poisonous to both dogs and cats if the dose is right. Garlic is considered to be about five times as toxic as onions for cats and dogs. ... While minute amounts of these foods in some pets, especially dogs, may be safe, large ingestions can be very toxic.
SOURCE: www.petpoisonhelpline.com/poison/garlic/

In general, you should avoid giving people food to pets. If nothing else, vegetables need a longer digestive tract than meats, and that is why some dog foods contain some vegetables, but cat foods never do.