I have heard from a lot of people and even some people who are not vets but work in vet offices, that say these days it seems ticks and fleas live through Frontline, like they have become immune to that now.
I can see how this happens, evolution takes its part in how humans, animals and now I guess insects grow through the ages and all the chemicals in the environment. More and more we grow immune whether through medicine or not so I guess is only the same type of thing going on with fleas and ticks and Frontline.
And of course as someone else previously said that they don't prevent, just kill. But I hear most times than not, it doesn't even kill them anymore. |