I have the same case. We do get her groomed regularly, just so her anal glands are milked, to try to prevent this. No need to feel bad that your pittie has tapeworms. I have 2 16 lb dachshunds, 1 25 lb bostone Terrier and 1 60 lb pit bull. I just found out this morning. And I have perfectly healthy dogs with home treatments and regular doctor visits.
Many dogs never seem to have a problem with their anal glands. However, bacteria can build up in the anal glands if they don't express properly, and this can lead to an infection. Left untreated, the infection can produce an abscess which may eventually rupture through the skin and cause further complications. If you own a dog and you see him scooting across your living room carpet, there might be a problem in his anal glands. Anal sacs, or anal glands, carry some smelly fluid and occasionally need to be expressed, or emptied. Many dogs express them by themselves every time they poop — the sacs are around a dog’s anus — but occasionally the sacs fill with fluid and your dog needs some help to release the fluid.