Regarding the author of that “Dogs Naturally” article (link in an above post) Dr. Deva Khalsa, a popular alternative veterinarian
Garlic for Pets- What’s it Good for?
8. Garlic is an effective flea control method.
Doubtful. There are, of course, plenty of anecdotes from people saying that garlic drove the fleas away from their pets like magic. There are just as many that say garlic didnāt help at all. There is absolutely no research evidence showing garlic supplements to be an effective form of flea control. It is often given with Brewerās yeast, which has been shown to be ineffective as a flea repellant. So for all the confidence with which this claim is made, it is simply made up.
More here http://skeptvet.com/Blog/2015/09/naet-a-cure-for-allergies-not/
