After years of using Frontline, the effectiveness of the product diminished as rapidly as the cost increased. I looked for something else and came across the 'Advantage' product. What drew me to the product was the headline on Google, "No longer need prescription". A quick search on Amazon and was pleased that not only was it stocked but was 25% cheaper than the Frontline equivalent. The liquid comes in a sealed container, which, unless one reads the instructions, will not get onto the dog. One has to remove the top, reverse it back into the nozzle and then give it a twist to unlock the tube. Very ingenious. The liquid itself is very runny and unlike Frontline, is quite odourless. My dogs fur is quite long and at first did not become wet. After a few hours though, like using Frontline, the area around the application became a little stiff. This soon brushed out the next morning. I checked my dog after 18 hours and could find no fleas, so the product worked for him and me. We will repeat use it for the recommended 4 four week dosage, and hopefully we'll have a flea free dog!