Willoughby has tapeworm, I saw them around his butt yesterday. I am going to pick up some dewormer tomorrow. But I was wondering about something. I have had two fecals done on him at two different vet clinics and they both came up negative for any problems. Both were done in the last month. What is the chance that he had them even though the test came up negative? Do you if he doesn't have them too bad then maybe the test would be negative for that reason? What's going on? I KNOW he has them since I saw them.