Yes, the more we use the poisons, flea/tick preventatives, the more they become immune however, there is an ALL NATURAL/completely safe product that you can spray in your yard, dust on your pet and the fleas/ticks will NEVER become immune to it. Better yet, you can even eat it! Ok, I'm done with the sales pitch...LOL!!
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Just watch the video. We use it for EVERYTHING and it really does work.
