Stopped by vet to pick up iverectin on Monday. Vet was amazed we were still having trouble. Dosed both Dapper Dan and Midnight with the ivermectin on Monday. Yesterday, more pinworms showed up for DD. This is just too weird. I think in 4 weeks I will do the Exodus again. Will ask the vet for an opinion if that is too soon. Trying to keep all the manure picked up in the areas they are confined. I looked back, and the first time the pinworms showed up was when I had the horse Rowdy, two years ago. Someone suggested that because DD is older, he may be more affected by parasites. Anyone have thoughts on that? Also still having ticks. At least all this varmint trouble is keeping me on my toes grooming and handling them, since we are not doing much driving right now. Interestingly, we have had zero bot flies this year. Thank goodness for small favors.