I have an Aussie that goes everywhere with me. We go on long trail rides and my dog follows the horses for miles. He jumps into all the water he can find and swims and frolics. When we get home, I find a huge number of ticks on him. I pick off what I can. But by the next morning, the ticks are dead and crispy and I can comb them out of his long haired coat. Even on day 30, the PetArmor is still killing those ticks. It is very impressive that this product withstands water and time and delivers what it promises! I thank you, and my dog especially thanks you!