How much garlic can i give Ruckus (43lbs) and Lynn (32lbs) daily in there food. Lynn is on comfortis and is doing great on it. Not a flea one! However Ruckus can not take comfortis because it gives him very bad runs. Where I live frontline, or advantage/advantix does not even work. It cuts fleas about in half, but I do not want to use something potentially dangerous and STILL have fleas on him! Also, is minced garlic okay? How much?