If animals are allowed to roam and pick up stuff, then maybe no dog in the house is a good suggestion. I have 2 little poodles whom I have treated right along with myself all thru this program. They do go outside for a hike with me, but are not allwed outside, otherwise. They have expelled some parasites. One has had some fatty tumors that have gone away with just giving the Barefoot dewormer.
I would rather think that you have not eradicated the main infestation than it's what you think that you are just getting re-infested.