It's one of two things: either the initial tapeworm infestation isn't being treated effectively and keeps coming back, or your dog is ingesting new tapeworms somehow. Do you keep your yard clean? Does he eat his own poop? Does he go off into the woods and hunt for things? I suspect the treatment you have been using isn't working. I would check with the vet and see what they suggest. It's usually a one dose treatment, but the entire dose has to be taken all at the same time, otherwise the tapeworms will not be killed.
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