Norway's Food Safety Authority says it's still investigating the cause of the disease, whose symptoms include vomiting and bloody diarrhea.
The agency said Monday a conclusion on the disease is still pending and so far nearly 90 different breeds have had similar symptoms.
It also has recommended that dogs should be held on a leash, avoid close contact with other animals and not be allowed to sniff areas or eat anything where other dogs might have been.
As a precaution, dogs from Norway have been temporarily banned from canine shows in neighboring countries. No cases have been reported outside Norway.
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