Parametorchis spp

From Dog
Adult P. complexus[1]

Parametorchis spp are a parasitic trematode of dogs in Asian countries.

Species which are pathogenic to dogs include:

  • Parametorchis complexus

These trematodes rely on two intermediate hosts (snails and marine fish[2]).

Metacercaria are ingested by dogs, which migrate up the bile and pancreatic ducts, where they lay eggs[3].

Clinical signs in dogs are usually absent but migration of flukes can cause acute hepatitis and pancreatitis.

Diagnosis is based on identification of eggs in feces using ethyl acetate sedimentation.

A differential diagnosis would include other hepatic and bile duct flukes such as Opisthorchis spp, Metorchis spp and Clonorchis spp.

Treatment is effective with praziquantel.


  1. University of Pennsylvania
  2. Cribb TH et al (1999) Faustulid trematodes (Digenea) from marine fishes of Australia. Syst Parasitol 44(2):119-138
  3. Bowman, DD (2009) Georgis' parasitology for veterinarians. Elsevier Saunders, Missouri. pp:125-126