The only way for a dog to have tapeworms is to have fleas. That is the lifecycle of the tapeworm...the dog eats the flea and then it becomes a tapeworm.....This does not mean your dog is infested with fleas, it only takes one! I would keep using the Dawn or go to a monthly topical flea treatment or research some holistic things with garlic.....
The vet can also rule out there are any other worms or if you have concern for them use Drontal as your wormer since it will kill tapes, rounds and hookworms
The vet can also rule out there are any other worms or if you have concern for them use Drontal as your wormer since it will kill tapes, rounds and hookworms