Yes some area's are prone to more worms. We live in the high desert. Alot of wild life. We found out our area is infested with tapeworns. We have been battling it for two months. We just can't seem to get a hold on it. We have tried Valbazin, but they still have them. Don't like to give our girls chemicals but don't have much choice. Can anyone tell me how many times can you give them Valbazin?