The geographical limitations are likely caused by the limited habitats of infected snails. The onset of symptoms is usually sudden, usually 5-7 days after ingestion but can be delayed up to a month. The dog's temperature can peak suddenly and then return to normal or even below normal. There can be severe and bloody diarrhea, dehydration, severe weight loss and complete loss of appetite. Symptoms can look like parvo or distemper.
Diagnosis is made by finding fluke eggs in the stool.
Death is generally caused by the toll the symptoms take on the dog's body. These include electrolyte imbalance, anemia and dehydration. Treatments include hydration and nutrition, blood transfusions as well as antibiotics and related medications prescribed by a veterinarian. Dogs that have been infected and recovered can develop an immunity. Since fish can also have tiny bones that can become lodged in your dog's throat or intestinal tract, it may be best to avoid fresh fish altogether.