Do you all have Sevin Dust out there? That is what we used to use and I also buy Paramite Cattle/Swine rub then dilute it down one tbsp per gallon, pour it on and rub it in I think it has a 6 month residual.
We do, it comes in a gallon but it says in the fine print in all caps NOT FOR USE ON ANIMALS. It's also in liquid form. I don't mind doing it every month, would rather do it that way, same time I worm, I am just wondering if this is ok.