Been using Bio-groom Flea & Tick 14 Spray for years, ever since my first dog was allergic to flea collars. With every "new" product that came out on the market, this still worked the best. The two dogs I have now, 12 & 16, have never had a flea, and the couple of times we found a tick on them they were dead on top of their hair. In my experience, I would highly recommend this product.