Mirka is right. you just use Fenbendazol (Panacur) or Metronidazol for 5!!! days (Three days are not enough!) , then pause for about two weeks then do another 5!!! days treatment.
They get resistent with the time.
Girardia gets more and more common and should be the first thing to look for repeatedly with the symptoms your dog showed.
Ina
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