a human case of zoonotic dog tapeworm dipylidium caninum we described a human case of zoonotic dog tapeworm dipylidium caninum eucestoda dilepidiidae rarely occurring in china the mother of a 17 monthold boy noted the appearance of small white and active worms over a month period in her sons feces but the boy was asymptomatic except mild diarrhea we observed 3 tapeworm proglottids resembling cucumber seeds in his stool sample microscopically each proglottid had 2 genital pores 1 on each lateral edge and numerous egg capsules in the uterus the patient was successfully treated with a single oral dose of praziquantel adult worms were recovered in the diarrheic stool after praziquantel treatment and purgation his family had household pet dogs for several years and he might have acquired the infection by ingestion of infected fleas of his pet dogs a history of dog or cat pets and flea bites may be important clues to diagnosis of d caninum infection the infected pets should also be treated