At least two dozen dogs in 13 of Norway's 18 administrative regions have died and 200 others have been sickened by an unidentified agent, health officials say. Providencia alcalifaciens and Clostridium perfringens were found in some of the dogs' guts, and other possible culprits include viruses, wild mushrooms, parasites or environmental factors, according to the Veterinary Institute, which has sent surveys to 2,000 veterinarians.
Veterinarians, health officials in Norway investigate cause of dog deaths
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