I have Panacur 1000ML for when I have puppies and rescues. It take 20ml for my boy, forgot to mention that. It did not work. Panacur does not work on all tapeworms, the most common tapeworms caused by fleas are killed by using praziquantel.
If the ear leather-fold is already setting in then there is really no use in trying to get the ears done. Some vets will not go over 16 wks, but then ag...
I have had dogs all my life. I currently raise, breed and show Great Danes. I only have three at the moment. Never in my day have I ever had the problem with tapeworm...