You can worm them yourself using Panacur (fenbendazole). Just dust their food for 3 consecutive feedings. You can also do your own fecal exams. Do an internet search and you will find articles that tell you how. We treat our animals once a month in this manner. Our fecals are always normal. You can get Panacur at almost any online pet med source for around $7.00. A little goes a long way.