The Norwegian Food Safety Authority confirmed another six cases of dogs falling ill on Saturday, of which two had already died.
The illness has struck pets across the country from the northern province of Nordland to cities like Trondheim Bergen and Oslo, where the majority of cases have been reported.
All of those to have died experienced the same symptoms of vomiting and diarrhea.
Autopsies of the first three dogs to have died is yet to prove what is causing the sickness, with veterinarians considering the potential for viral, bacterial, fungal and parasitic causes.
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SOURCE: The Independent, Vincent Wood