PetzLife Herbal Defense Powder,  4 oz INTERNAL: Use our Herbal Defense Organic Powder formula to repel ticks, stopping them from infecting your pet's bloodstream. Herbal Defense Powder is a safe non-toxic herbal recipe that makes your pets skin undesirable to biting insects. You simply mix the specified amount on your pet's food or favorite treat twice a day for five days. Your pet will be protected for 1-2 months and the recipe takes effect in as little as 5-10 days. 100% safe for dogs and cats.