Veterinarian Dennis McDonald was treating several puppies in isolation chambers at the North Fork Animal Clinic.
McDonald said the puppies were all sold from the same pet store last week.
The virus causes dogs to become listless, vomit frequently and produce bloody diarrhea. Puppies are particularly susceptible to the virus, and could die unless treated quickly.
"The whole lining of the intestine is being attacked by the virus. It sluffs off, peels off and that's where the bloody diarrhea comes from," McDonald said.
McDonald said when infected animals are in contact with one another — as may have been the case in the pet store — the virus is easily spread.
McDonald said the puppies currently treated at his clinic are all expected to recover.
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