Excerpt:

"Garlic appears to have anti-bacterial and anti-viral properties. The list is long when it comes to its uses as a remedy. This list includes wounds, ulcers, skin infections, flu, athlete's foot, some viruses, strep, worms, respiratory ailments, high blood pressure, blood thinning, cancer of the stomach, colic, colds, kidney problems, bladder problems, and ear aches, to name a few. It is believed to cure worms in both people and animals - try giving the dog a clove of garlic daily (but he's not gonna like it)."
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I found a solution for the breath problem: CHEW CLOVES. It works.

Solution for the dog not wanting it: Cut up small bits and hide it inside of a piece of meat. But don't give him too much it will upset his tummy.
This also helps prevent worms in dogs.